Physics Final II

1100 V

The current flowing through a circuit is changing at a rate of 6.0 A/s. If the circuit contains a 190-H inductor, what is the emf across the inductor?

perpendicular to both the current and the magnetic field

The direction of the force on a current-carrying wire in a magnetic field is

590nm

The distance between the ruled lines on a diffraction grating is 1770 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 400 nm to 700 nm wavelength band. What is the longest wavelength that appears in the third order spectrum?

-16 nC

The electric field at a point 2.8 cm from a small object points toward the object with a strength of 180,000 N/C. What is the object's charge q? (k = 8.99 × 109 N * m2/C2)

double the charge to 2Q

The electric field at point P due to a point charge Q a distance R away from P has magnitude E. In order to double the magnitude of the field at P, you could

5.0 cm

The magnetic field at point P due to a 2.0-A current flowing in a long, straight, thin wire is 8.0 μT. How far is point P from the wire?

1.0 × 10^-4 V

The magnetic flux through a coil changes steadily from 4.0 × 10^-5 T * m^2 to 5.0 × 10-5 T * m^2 in 0.10 s. What emf is induced in this coil?

30mA

The magnitude of the magnetic field that a long and extremely thin current-carrying wire produces at a distance of 3.0 µm from the center of the wire is 2.0 × 10-3 T. How much current is flowing through the wire?

larger

When a ferromagnetic material is placed in an external magnetic field, the net magnetic field of its magnetic domains becomes

The frequency of the fundamental

When a guitar is tuned to adjust it pitch, what is it that is changed?

only its speed and wavelength change

When a light wave enters into a medium of different refractive index,

80cm

When a person stands 40 cm in front of a cosmetic (concave) spherical mirror, the upright image is twice the size of the object. What is the focal length of the mirror?

0.63°

When a single slit that is 0.050 mm wide is illuminated by light of 550-nm wavelength, what is the angular separation between the first two minima on one side of the central maximum?

2.4 cm

When an object is 12 cm in front of a concave mirror, the image is 3.0 cm in front of the mirror? What is the focal length of the mirror?

1 mm/s

When current is flowing in an ordinary metal wire, the magnitude of the average velocity of the electrons is closest to

2

If the frequency of the motion of a simple harmonic oscillator is doubled, by what factor does the maximum speed of the oscillator change?

2 times as fast in vacuum as it does in the material

If the index of refraction of a material is 2, this means that light travels

1/3 of what it originally was

If the length and diameter of a wire of circular cross section are both tripled, the resistance will be

45 mA

If the power rating of a 400-ȍ resistor is 0.80 W, what is the maximum current it can safely draw?

decrease to one-half its original value

If the resistance in a constant voltage circuit is doubled, the power dissipated by that circuit will

an electric potential difference

If the result of your calculation of a quantity has SI units kg * m^2/(s^2 * C), that quantity could be

an electric field strength

If the result of your calculation of a quantity has SI units of kg * m/(s^2 * C), that quantity could be

a capacitance

If the result of your calculations for a quantity has SI units of C^2 * s^2/(kg * m^2), that quantity could be

step-up transformer

If the secondary coil of a transformer contains more loops than the primary coil, then it is a

the objects could be electrically neutral

If two objects are electrically attracted to each other,

you will see your image and you will appear smaller than you

If you stand in front of a convex mirror, at the same distance from it as its focal length,

you will see your image and you will appear smaller than you

If you stand in front of a convex mirror, at the same distance from it as its radius of curvature,

1.27 Hz

If your heart is beating at 76.0 beats per minute, what is the frequency of your heart's oscillations in hertz?

the south side

) A flat circular wire loop lies in a horizontal plane on a table and carries current in a counterclockwise direction when viewed from above. At this point, the earth's magnetic field points to the north and dips below the horizontal. Which side of the coil tends to lift off of the table due to the magnetic torque on the loop?

9.1 µC

A +3.0-µC point charge is initially extremely far from a positive point charge Q. You find that it takes 41 J of work to bring the +3.0-µC charge to the point x = 3.0 mm, y = 0.0 mm and the point charge Q to the point x = -3.0 mm, y = 0.00 mm. What is Q?

7.7 nJ

A +5.0-nC charge is at the point (0.00 m, 0.00 m) and a -2.0-nC charge is at (3.0 m, 0.00 m). What work is required to bring a 1.0-nC charge from very far away to point (0.00 m, 4.0 m)?

25 MN/C

A +5.0-µC point charge is 12 cm from a -5.0-µC point charge. What is the magnitude of the electric field they produce at the point on the line connecting them where their electric potential (relative to infinity) is zero? (k = 9.0 × 109 N* m2/C2)

38 m/s

A 0.13-m string, fixed at both ends and vibrating in its n = 4 harmonic, excites a pipe that is 0.88 m long and open at both ends, into its second overtone resonance. What is the speed of transverse waves on the string? The speed of sound in air is 345 m/s.

11 cm

A 1.4-cm tall flower is 4.0 cm from a spherical concave mirror. If the image of the flower is 4.0 cm tall, how far is the image from the mirror?

120 Ω

A 100-W light bulb is operated by a 110-V dc source. What is the resistance of this bulb?

0.91 A

A 100-W resistance heater is connected to a 110-V dc source. What current flows through the heater?

4.5 × 10^19

A 12-V battery is connected across a 100-Ω resistor. How many electrons flow through the wire in 1.0 min? (e = 1.60 × 10^-19 C)

0.65 mm

A 120-m long metal wire having a resistivity of 1.68 × 10-8Ω * m has a resistance of 6.0 Ω. What is the diameter of the wire?

46 mA

A 120-Ω laboratory resistor is rated at 0.25 W. How much current can safely flow through the resistor?

1.1 mm

A 14-mm tall postage stamp is 4.0 mm from a converging lens. If the image of the stamp is 4.0 mm tall, how far is it from the lens?

377 nm

A 17-mm-wide diffraction grating has rulings of 530 lines per millimeter. White light is incident normally on the grating. What is the longest wavelength that forms an intensity maximum in the fifth order?

11 s

A 2.0-µF capacitor is charged to 12 V and then discharged through a 4.0-MΩ resistor. How long will it take for the voltage across the capacitor to drop to 3.0 V?

0.23 s

A 2.0-µF capacitor that is initially uncharged is charged through a 50-kΩ resistor. How long does it take for the capacitor to reach 90% of its full charge?

0.0430 T * m^2

A 2.00-m long metal wire is formed into a square and placed in the horizontal xy-plane. A uniform magnetic field is oriented at 30° above the horizontal with a strength of 0.344 T. What is the magnetic flux through the square due to this field?

0.035 A

A 200-Ω resistor is rated at 1/4 W. What is the maximum current it can safely draw?

0.48 kΩ

A 25-W soldering iron runs on 110 V dc. What is its resistance?

69 mm^2

A 3.0-pF capacitor consists of two large closely-spaced parallel plates that have surface charge densities of ±1.0 nC/mm2. If the potential across the plates is 23.0 kV with only air between them, find the surface area of each of the plates. (E0 = 8.85 × 10^-12 C2/N * m2)

430 nm and 720 nm

A 360-nm thick oil film floats on the surface of a pool of water water. The indices of refraction of the oil and the water are 1.5 and 1.33, respectively. When the surface of the oil is illuminated from above at normal incidence with white light, what are the two wavelengths of light between 400 nm to 800 nm wavelength that are most strongly reflected?

540 nm

A 360-nm thick oil film floats on the surface of a pool of water. The indices of refraction of the oil and the water are 1.50 and 1.33, respectively. When the surface of the oil is illuminated from above at normal incidence with white light, what is the wavelength of light between 400 nm to 800 nm wavelength that is most weakly reflected?

The image is real, 4.0 cm tall, 60 cm on the other side of the lens

A 4.0-cm tall object is placed 60 cm in front of a converging lens of focal length of magnitude 30 cm. What are the nature and location of the image?

400 V

A 4.0-g bead carries a charge of 20 µC. The bead is accelerated from rest through a potential difference V, and afterward the bead is moving at 2.0 m/s. What is the magnitude of the potential difference V?

0.24 m

A 4.0-g string is 0.36 m long and is under tension. The string vibrates at 500 Hz in its third harmonic. What is the wavelength of the standing wave in the string?

250 N

A 4.0-g string is 0.39 m long and is under tension. The string vibrates at 600 Hz in its third harmonic. What is the tension in this string?

98 µJ

A 5.0 µF capacitor has a potential difference of 5.0 V applied across its plates. If the potential difference across its plates is increased to 8.0 V, how much additional energy does the capacitor store?

33 µF

A 5.0-µF and a 12.0-µF capacitor are connected in series, and the series arrangement is connected in parallel to a 29.0-µF capacitor. How much capacitance would a single capacitor need to replace this combination of three capacitors?

16.3 N/m

A 51.8-kg bungee jumper jumps off a bridge and undergoes simple harmonic motion. If the period of oscillation is 11.2 s, what is the spring constant (force constant) of the bungee cord?

2.1 mC

A 6.0-µF air-filled capacitor is connected across a 100-V potential source (a battery). After the battery fully charges the capacitor, it is left connected and the capacitor is immersed in transformer oil, which has a dielectric constant of 4.5. How much additional charge flows from the battery onto the capacitor during this process?

12MV

A 6.9 µC negative point charge has a positively charged particle in an elliptical orbit about it. If the mass of the positively charged particle is 1.0 µg and its distance from the point charge varies from 4.0 mm to 16.0 mm, what is the maximum potential difference through which the positive object moves? (k = 9.0 × 10^9 N *+ m2/C2)

3.6 m/s

A bat emits a sound at a frequency of 39.0 kHz as it approaches a wall. The bat detects beats with a frequency of 827 Hz between the sound it emits and the echo bouncing from the wall. What is the speed of the bat if the speed of sound in air is 343 m/s?

It increases

A battery charges a parallel-plate capacitor fully and then is removed. The plates are then slowly pulled apart. What happens to the potential difference between the plates as they are being separated?

6.9 MJ

A battery is rated at 12 V and 160 A-h. How much energy does this battery store?

20.9°

A beam of light in air enters a glass slab with an index of refraction of 1.40 at an angle of incidence of 30.0°. What is the angle of refraction?

50.2°

A beam of light in water (of refractive index of 1.33) enters a glass slab (of refractive index 1.50) at an angle of incidence of 60.0°. What is the angle of refraction in the glass?

20.7°

A beam of light of wavelength 600 nm is incident normally on a diffraction grating with a spacing between slits of 1.70 × 10-4 cm. At what angle away from the centerline does a first-order maximum occur?

8.5 cm

A beam of light of wavelength 600 nm passes through a slit that is 3.1 × 10^-5 m wide, and then goes on to a screen that is 2.2 m from the slit. On the screen, how far is the second dark fringe from the center of the diffraction pattern?

5.67 mm

A beam of light of wavelength 630 nm is incident on a slit that is 0.400 mm wide. If the distance between the slit and the screen is 1.80 m, what is the width on the screen of the central bright fringe?

It appears to be coming from a point between the focal point and the center of curvature of the mirror

A beam of light that is parallel to the principal axis strikes a convex mirror. What happens to the reflected beam of light?

827 nm

A beam of monochromatic light passes through a slit that is 11.0 μm wide. If the first order dark fringe of the resulting diffraction pattern is at an angle of 4.31° away from the centerline, what is the wavelength of light?

0.59 mm

A camera lens having a 50-mm focal length is set to f/4.0. What is the minimum spacing of two objects located 12 m from the lens if the objects are just barely resolved in the image using light of wavelength 500 nm?

2.2 mrad

A camera used for aerial mapping has a lens with a 30-cm diameter maximum aperture and a 42-cm focal length. Light of 550 nm wavelength is used to form the image. Assuming that the resolution of the camera is limited only by diffraction, what is the smallest angle (in milliradians) subtended by an object on the ground that can be resolved by this camera at maximum aperture?

three times a large as before

A capacitor C is connected in series with a resistor R across a battery and an open switch. If a second capacitor of capacitance 2C is connected in parallel with the first one, the time constant of the new RC circuit will be

1.35 × 10^-7 rad

A certain astronomical telescope has a diameter of 5.60 m. What is the minimum angle of resolution for this telescope when it is forming images using light of wavelength 620 nm?

550 m

A certain factory whistle can be heard up to a distance of 9.8 km. Assuming that the acoustic output of the whistle is uniform in all directions, at what distance from the factory is the intensity level of the whistle sound equal to 25 dB? The threshold of human hearing is 1.0 × 10-12 W/m2

0.10 A

A charge of 12 C passes through an electroplating apparatus in 2.0 min. What is the average current in the apparatus?

follow a circular path

A charged particle is injected into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field lines. Ignoring the particle's weight, the particle will

in a plane parallel to Earth's surface.

A charged particle moves with a constant speed through a region where a uniform magnetic field is present. If the magnetic field points straight upward, the magnetic force acting on this particle will be strongest when the particle moves

along the +y-axis

A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. A uniform electric field is also present. Due to the combined effect of both fields, the particle does not change its velocity. What is the direction of the electric field?

The particle could be either positive or negative

A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. Because of an electric field along the +y-axis, the charge particle does not change velocity. What is the sign of this particle?

may experience a magnetic force, but its speed will not change

A charged particle that is moving in a static uniform magnetic field

counterclockwise

A circular coil lies flat on a horizontal surface. A bar magnet is held above the center of the coil with its north pole pointing down. If the magnet is dropped from this position what is the direction of the induced current in the coil, as viewed from above?

0.016 V

A circular coil of 20 turns and radius 5.0 cm is placed with its plane oriented at 90° to a uniform magnetic field of 0.10 T. The field is now increased at a steady rate, reaching a value of 0.50 T after 4.0 seconds. What emf is induced in the coil?

No current is induced in the coil

A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held above the center of the coil with its south pole downward. The magnet and the coil are now both raised upward with the same velocities. As viewed from above, what is the direction of the current induced in the coil as the magnet approaches the coil?

clockwise

A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held above the center of the coil with its south pole downward. The magnet is released from rest and falls toward the coil. As viewed from above, what is the direction of the current induced in the coil as the magnet approaches the coil?

0.15303932 A

A circular conducting loop with a radius of 0.50 m and a small gap filled with a 10.0-Ω resistor is oriented in the xy-plane. If a uniform magnetic field of 1.0 T, making an angle of 30° with the z-axis, increases to 10.0 T, in 4.0 s, what is the magnitude of the current that will be caused to flow in the loop if it has negligible resistance?

0.16 T/s

A closed flat loop conductor with radius 2.0 m is located in a changing uniform magnetic field. If the emf induced in the loop is 2.0 V, what is the rate at which the magnetic field strength is changing if the magnetic field is oriented perpendicular to the plane in which the loop lies?

-9.9 cm

A toy is 14 cm in front of a convex spherical mirror. If the image of the toy is 5.8 cm behind the mirror, what is the focal length of the mirror?

clockwise

A coil lies flat on a horizontal tabletop in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

The induced current flows counterclockwise

A coil lies flat on a tabletop in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

4E

A coil of wire containing N turns is in an external magnetic field that is perpendicular to the plane of the coil and it steadily changing. Under these circumstances, an emf İ is induced in the coil. If the rate of change of the magnetic field and the number of turns in the coil are now doubled (but nothing else changes), what will be the induced emf in the coil?

0.0 V

A coil with a self-inductance of 6.0 H has a constant current of 2.0 A flowing through it for 2.0 s. What is the emf induced in this coil?

12 V

A coil with a self-inductance of 6.0 H is connected to a dc battery through a switch. As soon as the switch is closed, the rate of change of current is 2.0 A/s. What is the emf induced in this coil at this instant?

2.2 cm in front of the mirror

A concave mirror having a focal length of magnitude 5.0 cm forms an image 4.0 cm behind the mirror. Where is the object for this image?

20 cm behind the mirror

A concave spherical mirror has a focal length of magnitude 20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is the image located?

60 cm in front of the mirror

A concave spherical mirror has a focal length of magnitude 20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the image located?

15 cm

A concave spherical mirror with a radius of curvature of 20 cm creates a real image 30 cm from the mirror. How far is the object from the mirror?

29 T/s

A conductor is formed into a flat loop that encloses an area of 1.0 m^2. The plane of the loop is oriented at a 30.0° angle with the xy-plane. A uniform time-varying magnetic field is oriented parallel to the z-axis. If the emf induced in the loop is 25.0 V, what is the rate at which the magnetic field strength is changing?

All the free electrons go to the surface of the conductor; The electric field is zero inside the conductor; The electric field just outside the surface of the conductor is perpendicular to the surface

A conductor is placed in a steady external electric field. Which of the following statements are correct for this situation? (There could be more than one correct choice.)

4.4 × 10^-4 V

A constant uniform magnetic field of 0.50 T is applied at right angles to the plane of a flat rectangular loop of area 3.0 × 10^-3 m^2. If the area of this loop changes steadily from its original value to a new value of 1.6 × 10^-3 m^2 in 1.6 s, what is the emf induced in the loop?

that is greater than 2f

A convex lens has focal length f. If an object is placed at a distance between f and 2f from the lens on the principal axis, the image is located at a distance from the lens

of 2f

A convex lens has focal length f. If an object is placed at a distance of 2f from the lens on the principal axis, the image is located at a distance from the lens

upright and reduced

A convex mirror has a focal length of magnitude f. An object is placed in front of this mirror at a point 2/3 f from the face of the mirror. The image will appear

6.7 cm behind the mirror

A convex spherical mirror has a focal length of magnitude 20 cm. If an object is placed 10 cm in front of the mirror on the mirror's axis, where is the image located?

-13cm

A cup that is 6.0 cm tall is in front of a concave lens. The image of the cup is 2.5 cm tall and 7.5 cm from the lens. What is the focal length of the lens?

14

A current of 2.0 A in the 100-turn primary of an ideal transformer causes 14 A to flow in the secondary. How many turns are in the secondary?

3.1 × 10^20

A current of 5.0 A flows through an electrical device for 10 seconds. How many electrons flow through this device during this time? (e = 1.60 × 10^-19 C)

point straight up

A current-carrying loop of wire lies flat on a horizontal tabletop. When viewed from above, the current moves around the loop in a counterclockwise sense. For points on the tabletop inside the loop, the magnetic field lines caused by this current

The field becomes weaker

A dielectric material such as paper is inserted between the plates of a capacitor as the capacitor holds a fixed charge on its plates. What happens to the electric field between the plates as the dielectric is inserted?

m= 3

A diffraction grating has 450 lines per millimeter. What is the highest order m that contains the entire visible spectrum from 400 nm to 700 nm?

31.5°

A diffraction grating with 396 lines/mm is illuminated with light of wavelength 343 nm. What is the angular separation between the two second-order bright fringes?

1.3 × 10^-15 N

A proton moving with a velocity of 4.0 × 10^4 m/s along the +y-axis enters a magnetic field of 0.20 T directed towards the -x-axis. What is the magnitude of the magnetic force acting on the proton? (e = 1.60 × 10^-19 C)

3.13 cm

A double slit that is illuminated with coherent light of wavelength 644 nm produces a pattern of bright and dark fringes on a screen 6.00 cm from the slits. If the slits are 2783 nm apart, what is the distance on the screen between the 4th and the 2nd bright fringes on one side of the central maximum?

11 × 10^-27 kg

A doubly charged ion with speed 6.9 × 10^6 m/s enters a uniform 0.80-T magnetic field, traveling perpendicular to the field. Once in the field, it moves in a circular arc of radius 30 cm. What is the mass of this ion? (e = 1.60 × 10^-19 C)

68°

A flashlight beam makes an angle of 60° with the plane of the surface of a calm lake before it enters the water. In the water what angle does the beam make with the plane of the surface? The index of refraction of water is 1.33

0.52 N × m

A flat circular coil has 200 identical loops of very thin wire. Each loop has an area of 0.12 m^2 and carries 0.50 A of current. This coil is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop. What is the magnitude of the magnetic torque on the coil?

2.1 N × m

A flat circular coil of wire having 200 turns and diameter 6.0 cm carries a current of 7.0 A. It is placed in a magnetic field of 0.60 T with the plane of the coil making an angle of 30° with the magnetic field. What is the magnitude of the magnetic torque on the coil?

0 T * m^2

A flat circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel

0.00 N × m

A flat circular loop of wire of radius 0.50 m that is carrying a 2.0-A current is in a uniform magnetic field of 0.30 T. What is the magnitude of the magnetic torque on the loop when the plane of its area is perpendicular to the magnetic field?

7.5 × 10^-6 N * m

A flat circular wire loop of area 0.25 m^2 carries a current of 5.0 A. This coil lies on a horizontal table with the current flowing in the counterclockwise direction when viewed from above. At this point, the earth's magnetic field is 1.2 × 10^-5 T directed 60° below the horizontal. What is the magnitude of the torque that the earth's magnetic field exerts on this loop?

10 W

A flat coil having 160 turns, each with an area of 0.20 m^2, is placed with the plane of its area perpendicular to a magnetic field of 0.40 T. The magnetic field changes uniformly from 0.40 T in the +x direction to 0.40 T in the -x direction in 2.0 s. If the resistance of the coil is 16 Ω, at what rate is power generated in the coil during this change?

perpendicular to the magnetic field

A flat coil is in a uniform magnetic field. The magnetic flux through the coil is greatest when the plane of its area is

0.41 V

A flat coil is wrapped with 200 turns of very thin wire on a square frame with sides 18 cm long. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0.00 T in 8.0 s, find the emf induced in the coil

6.7 V

A flat rectangular coil with dimensions of 8.0 cm × 10 cm is dropped from a zero magnetic field position into a 1.4-T magnetic field in 0.10 s. The coil has 60 turns and is perpendicular to the magnetic field. What is the average induced emf in the coil as a result of this action?

90 V

A flat square coil of wire with 15 turns and an area of 0.40 m^2 is placed with the plane of its area parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in a time of 0.050 s. What is the magnitude of the average induced emf in the coil?

7500

A generator produces 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by an ideal transformer and transmitted through a power line of total resistance 1.0 ȍ. Find the number of turns in the secondary if the primary has 200 turns

1.15

A glass plate having an index of refraction is 1.66 is immersed in a certain alcohol. The surface of the glass is inclined at an angle of 44° with the vertical. When a horizontal ray in the glass strikes the interface, you observe that it is at the critical angle. What is the index of refraction of the alcohol?

11°

A glass plate with an index of refraction is 1.57 is immersed in an oil having a refractive index of 1.40. The surface of the glass is inclined at an angle of 54° with the vertical. A horizontal light ray in the glass strikes the interface. What is the angle that the refracted ray, in the oil, makes with the horizontal?

circles the wire in a counter-clockwise direction

A horizontal wire carries a current straight toward you. From your point of view, the magnetic field caused by this current

increases

A hydrogen atom consists of a proton and an electron. If the orbital radius of the electron increases, the electric potential energy of the electron due to the proton

The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is equal to the force exerted on the carbon nucleus

A hydrogen nucleus, which has a charge +e, is situated to the left of a carbon nucleus, which has a charge +6e. Which statement is true?

n = c/v

A light beam has speed c in vacuum and speed v in a certain plastic. The index of refraction n of this plastic is

It will not leave.

A light beam is traveling inside a glass block that has an index of refraction of 1.46. As this light arrives at the surface of the block, it makes an angle of 53.0° with the normal. At what angle with the normal in the air will it leave the block?

78.6 Ω

A light bulb operating at 110 V draws 1.40 A of current. What is its resistance?

0.50 A

A light bulb operating at a dc voltage of 120 V has a power rating of 60 W. How much current is flowing through this bulb?

45°

A light ray in air strikes a glass plate whose index of refraction is 1.42. Some of the light reflects off the surface of the plate, but most of it enters the glass. If the angle of refraction is one-half the angle of reflection, the angle of refraction is closest to which one of the following angles?

counterclockwise in the east coil and clockwise in the west coil

A long straight wire lies on a horizontal table and carries an ever-increasing current toward the north. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the direction of the induced current in these coils is

0.67 µT

A long wire carrying a 2.0-A current is placed along the y-axis. What is the magnitude of the magnetic field at a point that is 0.60 m from the origin along the x-axis? (μ0 = 4π × 10-7 T * m/A)

counterclockwise, around the y-axis

A long, straight wire carrying a current is placed along the y-axis. If the direction of the current is in the +y direction, what is the direction of the magnetic field due to this wire as you view it in such a way that the current is coming directly toward you?

toward the north

A long, straight, horizontal wire carries current toward the east. A proton moves toward the east alongside and just south of the wire. What is the direction of the magnetic force on the proton?

toward the south

A long, straight, horizontal wire carries current toward the east. An electron moves toward the east alongside and just south of the wire. What is the direction of the magnetic force on the electron?

It's elastic potential energy is zero; its acceleration is zero; It's kinetic energy is maximum

A mass on a Spring undergoes SHM. When the mass passes through the equilibrium position, which of the following statements about it are true?

Its speed is zero

A mass on a spring undergoes SHM. When the mass is at its maximum distance from the equilibrium position, which of the following statements about it are true? (There could be more than one correct choice.)

7.0 mm

A metallic sheet has a large number of parallel slits, 5.0 mm wide and 20 cm apart. This sheet is used as a diffraction grating for microwaves. A wide parallel beam of microwaves is incident normally on the sheet. If the intensity maxima occur 2.0° apart in the central region, what is the wavelength of the microwaves?

64°

A metallic sheet has a large number of parallel slits, 5.0 mm wide and 20 cm apart. This sheet is used as a diffraction grating for microwaves. A wide parallel beam of microwaves is incident normally on the sheet. If the microwave wavelength is 6.0 cm, what is the largest angle from the normal, at which an intensity maximum occurs?

1.5 GHz

A metallic sheet has a large number of parallel slits, 5.0 mm wide and 20 cm apart. This sheet is used as a diffraction grating for microwaves. A wide parallel beam of microwaves is incident normally on the sheet. What is the smallest microwave frequency for which only the central maximum will occur? (c = 3.00 × 10^8 m/s)

the image is inverted, and the mirror is concave.

A negative magnification for a mirror means that

causes the particle to accelerate

A negatively-charged particle moves across a constant uniform magnetic field that is perpendicular to the velocity of the particle. The magnetic force on this particle

positively charged

A negatively-charged plastic rod is brought close to (but does not touch) a neutral metal sphere that is connected to ground. After waiting a few seconds, the ground connection is removed (without touching the sphere), and after that the rod is also removed. The sphere is now

The sphere near the charged rod becomes positive and the other one becomes negative

A negatively-charged rod is brought close to (but does not touch) two neutral spheres that are in contact with each other but insulated from the ground. If the two spheres are then separated, what kind of charge will be on the spheres?

1.5 × 10^7 m/s

A pair of charged conducting plates produces a uniform field of 12,000 N/C, directed to the right, between the plates. The separation of the plates is 40 mm. An electron is projected from plate A, directly toward plate B, with an initial speed of v0 = 2.0 × 107 m/s. What is the speed of the electron as it strikes plate B? (e = 1.6 × 10-19 C, m_electron = 9.11 × 10-31 kg)

1.1 × 10^-15 N

A proton moving with a velocity of 4.0 × 10^4 m/s enters a magnetic field of 0.20 T. If the angle between the velocity of the proton and the direction of the magnetic field is 60°, what is the magnitude of the magnetic force on the proton? (e = 1.60 × 10^-19 C)

Both the charge on the plates of the capacitor and its capacitance would change

A parallel-plate capacitor consists of a set of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery that maintains a constant potential difference across the plates. A slab of a dielectric material is inserted in the region between the plates and completely fills it. What changes would you observe as the dielectric is inserted? (There could be more than one correct choice.)

1.9 pF

A parallel-plate capacitor consists of two parallel, square plates having dimensions 1.0 cm by 1.0 cm. The plates are separated by 1.0 mm, and the space between them is filled with Teflon, which has a dielectric constant of 2.1. What is the capacitance of this capacitor? (E0 = 8.85 × 10^-12 C^2/N * m^2)

32 × 10^-12 F

A parallel-plate capacitor with plate separation of 4.0 cm has a plate area of 6.0 × 10^-2 m2.What is the capacitance of this capacitor if a dielectric material with a dielectric constant of 2.4 is placed between the plates, completely filling the space? (E0 = 8.85 × 10^-12 C2/N * m^2)

6.8a

A particle of charge +2q is placed at the origin and particle of charge -q is placed on the x-axis at x = 2a. Where on the x-axis can a third positive charge be placed so that the net electric force on it is zero?

1.2 × 10^4 N/C

A particle with a charge of +4.0 µC has a mass of 5.0 g. What magnitude electric field directed upward will exactly balance the weight of the particle?

6 m/s

A person jogs toward a plane mirror at a speed of 3 m/s. How fast is he approaching his image in the mirror?

constructive

A person stands between two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person is 1.65 m from one speaker and 4.95 m from the other. What type of interference does the person perceive?

200 nm

A piece of glass has a thin film of gasoline floating on it. A beam of light is shining perpendicular on the film. If the wavelength of light incident on the film is 560 nm and the indices of refraction of gasoline and glass are 1.40 and 1.50, respectively, what is the minimum nonzero thickness of the film to see a bright reflection?

1.25 × 10^13

A piece of plastic has a net charge of +2.00 µC. How many more protons than electrons does this piece of plastic have? (e = 1.60 x 10^-19 C)

The wavelength is 4L and there is a displacement antinode at the pipe's open end

A pipe of length L that is closed at one end and open at the other end is resonating at its fundamental frequency. Which statement about the sound is correct?

60 cm behind the mirror

A plant that is 4.0 cm tall is placed 15 cm from a concave spherical mirror having a focal length of magnitude 20 cm. Where is the image located?

30 m

A plant that is 4.1 cm tall is 10.3 cm from a converging lens. You observe that the image of this plant is virtual and 6.2 cm tall. What is the focal length of the lens?

is repelled by the sphere

A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic sphere that is insulated from ground. It is allowed to touch the sphere for a few seconds, and then is separated from the sphere by a small distance. After the rod is separated, the rod

v0 sqrt2

A proton is accelerated from rest through a potential difference V0 and gains a speed v0. If it were accelerated instead through a potential difference of 2V0, what speed would it gain?

7.66 × 10^10 m/s^2 in the direction of the electric field

A proton is placed in an electric field of intensity 800 N/C. What are the magnitude and direction of the acceleration of the proton due to this field? (e = 1.60 × 10^-19 C, m_proton = 1.67 × 10^-27 kg)

6.7 × 10^-16 N

A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the magnitude of the magnetic force that acts on the proton?

westward

A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary centripetal force. In what direction should the proton move?

1.6 × 10^-16 N upwards

A proton moving eastward with a velocity of 5.0 km/s enters a magnetic field of 0.20 T pointing northward. What are the magnitude and direction of the force that the magnetic field exerts on the proton? (e = 1.60 × 10^-19 C)

8.0 × 10^-17 J

A proton that is initially at rest is accelerated through an electric potential difference of magnitude 500 V. How much kinetic energy does it gain? (e = 1.60 × 10^-19 C)

630 V

A proton with a speed of 2.0 x 105 m/s accelerates through a potential difference and thereby increases its speed to 4.0 × 105 m/s. Through what magnitude potential difference did the proton accelerate?

T

A proton, moving in a uniform magnetic field, moves in a circle perpendicular to the field lines and takes time T for each circle. If the proton's speed tripled, what would now be its time to go around each circle?

towards the east

A proton, moving north, enters a magnetic field. Because of this field, the proton curves downward. We may conclude that the magnetic field must have a component

towards the south

A proton, moving west, enters a magnetic field. Because of this magnetic field the proton curves upward. We may conclude that the magnetic field must have a component

100 nm

A puddle of water has a thin film of gasoline floating on it. A beam of light is shining perpendicular on the film. If the wavelength of light incident on the film is 560 nm and the indices of refraction of gasoline and water are 1.40 and 1.33, respectively, what must be the minimum thickness of the film to see a bright reflection?

37°

A ray of light in glass strikes a water-glass interface at an angle of incidence equal to one-half the critical angle for that interface. The index of refraction for water is 1.33, and for the glass it is 1.43. What angle does the refracted ray in the water make with the normal?

11 A

A resistance heater is rated at 1200 W when operating at 110 V dc. What current will it draw?

37% of the original value

A resistor and an inductor are connected in series to a battery. The battery is suddenly removed from the circuit and replaced by a wire to complete the circuit. The time constant for of the new circuit represents the time required for the current to decrease to

63% of the maximum current

A resistor and an inductor are connected in series to a battery. The time constant for the circuit represents the time required for the current to reach

equal to the battery's terminal voltage

A resistor and an inductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

zero

A resistor and an inductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

Once the capacitor is essentially fully charged, there is no current in the circuit

A resistor, an uncharged capacitor, a dc voltage source, and an open switch are all connected in series. The switch is closed at time t = 0 s. Which one of the following is a correct statement about the circuit?

The charge on the capacitor after four time constants is about 98% of the maximum value

A resistor, an uncharged capacitor, a dc voltage source, and an open switch are all connected in series. The switch is closed at time t = 0 s. Which one of the following is a correct statement about this circuit?

1.4 mV

A round flat conducting loop is placed perpendicular to a uniform 0.50 T magnetic field. If the area of the loop increases at a rate of 3.0 × 10^-3 m^2/s, what is the induced emf in the loop?

0.25 m

A round flat metal coil has 180 turns and negligible resistance. It is connected in a series circuit with a 17-Ω resistor, with nothing else in the circuit. You measure that a 6.0-A current flows through the resistor when a magnetic field through the coil, perpendicular to its area, is changing at 3.0 T/s. What is the radius of the coil?

5.5 mm

A seed is 15 mm in front of a converging lens, and the image of the seed is 4.0 mm behind the lens. What is the focal length of the lens?

480 J

A simple circuit has a total resistance of 30 ȍ. If a 2.0-A current is maintained in this circuit, how much energy is dissipated in this circuit in 4.0 seconds?

41.5°

A single thin slit forms a diffraction pattern when illuminated with monochromatic light. The fourth minimum of the pattern occurs at an angle of 32.0° away from the central maximum. At what angle does the fifth minimum occur?

825 nm

A single thin slit forms a diffraction pattern, with the first minimum at an angle of 40.0° from central maximum. If monochromatic light of 530.0-nm wavelength is used for the illumination, what is the width of the slit?

It will double

A single-slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the wavelength of the illuminating light is doubled?

2.95 mA

A single-turn loop of wire, having a resistance of 8.00 Ω and a cross-sectional area 200 cm^2, is perpendicular to a uniform magnetic field that increases steadily from 0.200 T to 2.800 T in 2.20 seconds. What is the magnitude of the induced current in the loop?

0.31 N

A small 0.050-kg insulating sphere carries a charge of -60 ȝC and is hanging by a vertical silk thread from a fixed point in the ceiling. An external uniform vertical electric field is now applied. If the applied electric field has a magnitude of 3000 N/C and is directed downward, what is the tension in the silk thread? (k = 1/4ʌİ0 = 9.0 × 109 N Â m2/C2)

4.3 × 10^4 N/C

A small glass bead has been charged to 1.9 nC. What is the strength of the electric field 2.0 cm from the center of the bead?

2.0 N/C

A small object with a 5.0-ȝC charge is accelerating horizontally on a friction-free surface at 0.0050 m/s2 due only to an electric field. If the object has a mass of 2.0 g, what is the magnitude of the electric field?

-196 nC

A small styrofoam ball of mass 0.120 g is placed in an electric field of 6000 N/C pointing downward. What excess charge must be placed on the ball for it to remain suspended in the field?

The top surface is charged positively

A solid aluminum cube rests on a wooden table in a region where a uniform external electric field is directed straight upward. What can we say concerning the charge on the top surface of the cube?

1500 V

A sphere with radius 2.0 mm carries a +2.0 µC charge. What is the potential difference, VB - VA, between point B, which is 4.0 m from the center of the sphere, and point A, which is 6.0 m from the center of the sphere?

8.7 cm

A statue that is 10.4 cm tall is placed 4.8 cm in front of a concave lens. The image is 4.0 cm from the lens. How tall is the image?

3.0 A

A straight 1.0-m long wire is carrying a current. The wire is placed perpendicular to a magnetic field of strength 0.20 T. If the wire experiences a force of 0.60 N, what is the current in the wire?

contain a north pole on the right and a south pole on the left

A straight bar magnet is initially 4 cm long, with the north pole on the right and the south pole on the left. If you cut the magnet in half, the right half will

600 Hz

A stretched string is observed to have four equal segments in a standing wave driven at a frequency of 480 Hz. What driving frequency will set up a standing wave with five equal segments?

none of the above (-the speed of the traveling waves on the string -the wavelength of the traveling waves on the string -the period of the traveling waves on the string -the amplitude of the traveling waves on the string)

A string fixed at both ends is vibrating in one of its harmonics. If we now increase only the frequency at which the string is vibrating, which of the following characteristics do we also increase? (There could be more than one correct choice.)

v sqrt2

A string of length L is under tension, and the speed of a wave in the string is v. What will be the speed of a wave in the string if the length is increased to 2L but with no change in the mass or tension?

v/sqrt2

A string of mass m is under tension, and the speed of a wave in the string is v. What will be the speed of a wave in the string if the mass of the string is increased to 2m but with no change in the length or tension?

1.36

A thin beam of light enters a thick plastic sheet from air at an angle of 32.0° with the normal and continues in the sheet at an angle of 23.0° with the normal. What is the index of refraction of the plastic?

4.9 A

A thin copper rod 1.0 m long has a mass of 0.050 kg and is in a magnetic field of 0.10 T. What minimum current in the rod is needed in order for the magnetic force to balance the weight of the rod?

84.6 nm

A thin uniform film of oil that can be varied in thickness covers a sheet of glass of refractive index 1.52. The refractive index of the oil is 1.64. Light of wavelength 555 nm is shone from air at normal incidence on the film. Starting with no oil on the glass, you gradually increase the thickness of the oil film until the first interference maximum in the reflected light occurs. What is the thickness of the oil film at that instant?

0.050 mJ/m^3

A tiny particle carries a charge of 6.0 µC. What is the energy density in the electric field at a distance of 4.0 m from this charge?

2.5 × 10^-3 J

A tiny particle with charge + 5.0 µC is initially moving at 55 m/s. It is then accelerated through a potential difference of 500 V. How much kinetic energy does this particle gain during the period of acceleration?

18 Ω

A toaster is rated at 800 W when operating at 120 V dc. What is the resistance of its heating element?

operates only on ac

A transformer is a device that normally

increase or decrease an ac voltage

A transformer is a device used to

34.9 mm

A two-slit arrangement with 60.3 μm separation between the slits is illuminated with 491.0 nm coherent light. If a viewing screen is located 2.14 m from the slits, find the distance from the first dark fringe on one side of the central maximum to the second dark fringe on the other side.

4.0 kV

A uniform electric field, with a magnitude of 500 V/m, is points in the +x direction. If the potential at x = 5.0 m is 2500 V, what is the potential at x = 2.0 m?

toward the west

A vertical wire carries a current straight up in a region where the magnetic field vector points toward the north. What is the direction of the magnetic force on this wire?

1.0 mA

A very long thin wire produces a magnetic field of 0.0020 × 10^-4 T at a distance of 1.0 mm from the wire. What is the magnitude of the current?

1000 N

A violin with string length 32 cm and string density 1.5 g/cm resonates in its fundamental with the first overtone of a 2.0-m organ pipe with one end closed and one end open. What is the tension in the string if the speed of sound in air is 344 m/s?

horizontally towards the east

A wire is carrying current vertically downward. What is the direction of the force on this wire due to Earth's magnetic field?

The force is zero

A wire lying in the plane of this page carries a current directly toward the top of the page. What is the direction of the magnetic force this current produces on an electron that is moving perpendicular to the page and outward from it on the left side of the wire?

be two times the original diameter

A wire of resistivity ȡ must be replaced in a circuit by a wire of the same material but four times as long. If, however, the total resistance is to remain as before, the diameter of the new wire must

0.25

A wrench is placed at 30 cm in front of a diverging lens with a focal length of magnitude 10 cm. What is the magnification of the wrench?

4.3 rad/s

An object is undergoing simple harmonic motion of amplitude 2.3 m. If the maximum velocity of the object is 10 m/s, what is the object's angular frequency?

T

An object that hangs from the ceiling of a stationary elevator by an ideal spring oscillates with a period T. If the elevator accelerates upward with acceleration 2g, what will be the period of oscillation of the object?

False

According to Faraday's law, a coil in a strong magnetic field must have a greater induced emf in it than a coil in a weak magnetic field.

False

According to Lenz's law, the induced current in a circuit always flows to oppose the external magnetic field through the circuit.

False

According to Lenz's law, the induced current in a circuit always flows to oppose the external magnetic flux through the circuit.

0.15 μs

Alpha particles, each having a charge of +2e and a mass of 6.64 × 10^-27 kg, are accelerated in a uniform 0.80-T magnetic field to a final orbit radius of 0.30 m. The field is perpendicular to the velocity of the particles. How long does it take an alpha particle to make one complete circle in the final orbit? (e = 1.60 × 10^-19 C)

46°

An 18-mm-wide diffraction grating has rulings of 710 lines per millimeter. Monochromatic light of wavelength 506 nm wavelength is incident normally on the grating. What is the largest angle from the centerline at which an intensity maximum is formed?

90 µJ

An air-filled 20-µF capacitor has a charge of 60 µCon its plates. How much energy is stored in this capacitor?

0.077 mJ

An air-filled capacitor carries enough charge to store 6.00 mJ of potential energy. It is then accidentally filled with water in such a way as not to discharge its plates. How much energy does it continue to store after it is filled? The dielectric constant for water is 78 and for air it is 1.0006.

320 µJ

An air-filled capacitor has a potential difference between the plates of 80 V. If the charge on each of the plates of the capacitor has magnitude 8.0 ȝC, what is the electrical energy stored by this capacitor?

x= 0.0461 m

An air-track cart is attached to a spring and completes one oscillation every 5.67 s in simple harmonic motion. At time t = 0.00 s the cart is released at the position x = +0.250 m. What is the position of the cart when t = 29.6 s?

2.3 × 10^5 m/s

An alpha particle (a helium nucleus, having charge +2e and mass 6.64 × 10^-27 kg) moves head-on at a fixed gold nucleus (having charge +79e). If the distance of closest approach is 2.0 × 10^-10 m, what was the speed of the alpha particle when it was very far away from the gold? (k = 1/4ʌİ0 = 9.0 × 109 N * m^2/C^2, e = 1.60 × 10^-19 C)

0.000040 N

An asteroid of mass 58,000 kg carrying a negative charge of 15 uC is 180 m from a second asteroid of mass 52,000 kg carrying a negative charge of 11 uC. What is the magnitude of the net force the asteroids exert upon each other, assuming we can treat them as point particles? (G = 6.67 × 10-11 N * m2/kg2, k = 8.99 × 10^9 N * m2/C2)

double

An capacitor consists of two large parallel plates of area A separated by a very small distance d. This capacitor is connected to a battery and charged until its plates carry charges +Q and -Q, and then disconnected from the battery. If the separation between the plates is now doubled, the potential difference between the plates will

They are closer to the to the initial position of the proton that to the initial position of the electron

An electron and a proton are released simultaneously from rest and start moving toward each other due to their electrostatic attraction, with no other forces present. Which of the following statements are true just before they are about to collide? (There could be more than one correct choice.)

to the west

An electron has an initial velocity to the south but is observed to curve upward as the result of a magnetic field. This magnetic field must have a component

5.2 cm

An electron is accelerated from rest through a potential difference of 3.75 kV. It enters a region where a uniform 4.0-mT magnetic field is perpendicular to the velocity of the electron. Calculate the radius of the path this electron will follow in the magnetic field.

51,000 N/C

An electron is projected with an initial velocity v0 = 8.4 × 10^7 m/s along the y-axis, which is the centerline between a pair of charged plates, as shown in the figure. The plates are 1.0 m long and are separated by 0.10 m. A uniform electric field of magnitude E in the +x-direction is present between the plates. If the magnitude of the acceleration of the electron is measured to be 8.9 × 10^15 m/s 2, what is the magnitude of the electric field between the plates? (fig)

1.9 × 10^-15 N

An electron moves with a speed of 3.0 × 104 m/s perpendicular to a uniform magnetic field of 0.40 T. What is the magnitude of the magnetic force on the electron? (e = 1.60 × 10^-19 C)

1.6 × 10^-15 N

An electron moves with a speed of 5.0 × 10^4 m/s perpendicular to a uniform magnetic field of magnitude 0.20 T. What is the magnitude of the magnetic force on the electron? (e = 1.60 × 10^-19 C)

3.0 × 10^18 m/s^2

An electron moves with a speed of 8.0 × 10^6 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the xy-plane. Calculate the magnitude of the acceleration of the electron. (e = 1.60 × 10^-19 C, me1 = 9.11 × 10^-31 kg)

2.8 × 10^-12 N

An electron moves with a speed of 8.0 × 10^6 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the xy-plane. Calculate the magnitude of the magnetic force on the electron. (e = 1.60 × 10^-19 C)

+z direction

An electron moving in the +y direction, at right angles to a magnetic field, experiences a magnetic force in the -x direction. The direction of the magnetic field is in the

3.9 mm

An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5 × 10^7 m/s. What is the radius of the circle? (e = 1.60 × 10^-19 C, m_electron = 9.11 × 10^-31kg)

1.9 × 10^7 m/s

An electron moving perpendicular to a uniform magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving?

towards the west

An electron, moving south, enters a magnetic field. Because of this field, the electron curves upward. We may conclude that the magnetic field must have a component

towards the north

An electron, moving west, enters a magnetic field. Because of this field the electron curves upward. We may conclude that the magnetic field must have a component

0.91 A

An electronic component with a 17-Ω resistor is rated for use at power levels not exceeding 14 W. How much current can safely flow through the component?

40000 N/C downward

An ideal air-filled parallel-plate capacitor with horizontal plates has a plate separation of 5.0 cm. If the potential difference between the plates is 2000 V, with the top plate at the higher potential, what are the magnitude and direction of the electric field between the plates?

be cut in half

An ideal parallel-plate capacitor consists of two parallel plates of area A separated by a distance d. This capacitor is connected across a battery that maintains a constant potential difference between the plates. If the separation between the plates is now doubled, the magnitude of the charge on the plates will

double

An ideal parallel-plate capacitor consists of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery and charged until its plates carry charges +Q and -Q, and the battery is then disconnected. If the separation between the plates is now doubled, the electrical energy stored in the capacitor will

be cut in half

An ideal parallel-plate capacitor consists of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery that maintains a constant potential difference across the plates. If the separation between the plates is now doubled, the amount of electrical energy stored on the capacitor will

C/4

An ideal parallel-plate capacitor has a capacitance of C. If the area of the plates is doubled and the distance between the plates is halved, what is the new capacitance?

D sqrt 3

An ideal parallel-plate capacitor having circular plates of diameter D that are a distance d apart stores energy U when it is connected across a fixed potential difference. If you want to triple the amount of energy stored in this capacitor by changing only the size of its plates, the diameter should be changed to

0.31 T

An ideal solenoid 20 cm long is wound with 5000 turns of very thin wire. What strength magnetic field is produced at the center of the solenoid when a current of 10 A flows through it? (μ0 = 4π × 10^-7 T * m/A)

25 mT

An ideal solenoid having a coil density of 5000 turns per meter is 10 cm long and carries a current of 4.0 A. What is the strength of the magnetic field at its center?

1.6 T

An ideal solenoid of length 10 cm consists of a wire wrapped tightly around a wooden core. The magnetic field strength is 4.0 T inside the solenoid. If the solenoid is stretched to 25 cm by applying a force to it, what does the magnetic field become?

1220

An ideal solenoid that is 34.0 cm long is carrying a current of 2.00 A. If the magnitude of the magnetic field generated at the center of the solenoid is 9.00 mT, how many turns of wire does this solenoid contain? (μ0 = 4π × 10*-7 T * m/A)

0.0222 m

An ideal solenoid with 3000 turns is 70.0 cm long. If its self-inductance is 25.0 mH, what is its radius? (μ0 = 4π × 10^-7 T * m/A)

50 A

An ideal solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field at the center of the solenoid? (μ0 = 4π × 10^-7 T * m/A)

1:2

An ideal step-up transformer doubles a primary voltage of 110 V. What is the ratio of the number of turns in its primary coil to the number of turns in the secondary coil?

12 D

An ideal transformer consists of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primary?

4.3 cm from the mirror

An object is 10 cm in front of a concave spherical mirror with a focal length of magnitude 3.0 cm. Where is the image?

2.7cm

An object is 5.7 cm from a spherical concave mirror. If the image is 4.7 cm tall and 10 cm from the mirror, how tall is the object?

2.0

An object is placed 10 cm from a convex lens with a focal length of magnitude 20 cm. What is the magnification?

16 cm

An object is placed 15 cm from a spherical concave mirror with a focal length of magnitude 20 cm. If the object is 4.0 cm tall, how tall is the image?

60 cm to the left of the lens

An object is placed 15 cm to the left of a double-convex lens of focal length 20 cm. Where is the image of this object located?

0.54

An object is placed 21 cm from a concave lens having a focal length of magnitude 25 cm. What is the magnification?

-0.20

An object is placed 60 cm from a convex lens with a focal length of magnitude 10 cm. What is the magnification?

upright and reduced

An object is placed in front of a convex mirror at a distance larger than twice the magnitude of the focal length of the mirror. The image will appear

If the lens is concave, the image must be virtual; If the image is real, then it is also inverted

An object is placed in front of a thin lens. Which statements are correct in describing the image formed by the lens? (There could be more than one correct choice.)

18 cm

An object is placed near a concave mirror having a radius of curvature of magnitude 60 cm. How far should you place the object from the mirror so that the lateral magnification produced by the mirror will be +2.5?

The image is upright and virtual; The lens could be either a converging or a diverging lens, and the image is upright.

An object is placed on the left side of a thin lens, and the image of this object is formed on the left side of the lens. Which of the following statements must be true? (There could be more than one correct choice.)

The mirror could be either concave or convex; The image is upright and virtual.

An object is placed to the left of a spherical mirror in front of the mirror. If the image of the object is formed on the right side of the mirror, which of the following statements must be true? (There could be more than one correct choice.)

180 cm on the other side of mirror, virtual, 10.0 times bigger

An object that is 4.00 cm tall is placed 18.0 cm in front of a concave mirror having a focal length of 20.0 cm. What is the location of its image in relation to the mirror and what are its characteristics?

3.8 m behind the mirror's surface

An object that is 75 cm tall is located 3.8 m in front of a plane mirror. The image formed by the mirror appears to be

68.5 μm

An optical engineer needs to ensure that the bright fringes from a double-slit are 15.7 mm apart on a detector that is 1.70 m from the slits. If the slits are illuminated with coherent light of wavelength 633 nm, how far apart should the slits be?

open

An organ pipe of length L that is open at one end resonates in its third harmonic with a wavelength of 2L/3. Is the other end of the pipe closed or open?

counterclockwise

An outer metal ring surrounds an inner metal ring, as shown in the figure. The current in the outer ring is counterclockwise and decreasing. What is the direction of the induced current in the inner ring?

The wavelength is 2L and there is a displacement node at the pipe's midpoint

An pipe of length L that is open at both ends is resonating at its fundamental frequency. Which statement about the sound is correct?

real and inverted

An upright object is 50 cm from a concave mirror of radius 60 cm. The character of the image is

both its electric potential and electric potential energy remain constant

As a proton moves in a direction perpendicular to the electric field lines

it is moving from high potential to low potential and losing electric potential energy

As a proton moves in the direction the electric field lines

it is moving from high potential to low potential and gaining electric potential energy

As an electron moves in the direction the electric field lines

frequency; loudness

As you are moving very quickly toward a speaker emitting a pure tone, which characteristics of the sound get larger? (There may be more than one correct choice.)

is always the same size.

As you walk away from a plane mirror on a wall, the height of your image

0.01°

Assuming a pupil diameter of 3 mm, what is the angular resolution of the human eye for light at the middle of the visible spectrum (550 nm)?

19mi

Astronomers are proud of their telescopes and often say they can "resolve a dime at so many miles." How many miles from a 102-cm-diameter telescope mirror can you place a coin of diameter 3.0 cm and just resolve the coin using light of wavelength 389 nm? (1 mi = 1.609 km)

It is impossible to know without more information about the fields

At a certain instant, coil A is in a 10-T external magnetic field and coil B is in a 1-T external magnetic field. Both coils have the same area and are oriented at right angles to the field. Which coil will have a greater emf induced in it?

4u

At a distance d from a point charge Q, the energy density in its electric field is u. If we double the charge, what is the energy density at the same point?

16u

At a distance d from a point charge Q, the energy density in its electric field is u. If we now go to a distance d/2 from the charge, what is the energy density at the new location?

toward the south

At a particular instant, an electron moves toward the east in a uniform magnetic field that is directed straight downward. The magnetic force that acts on it is

33 cm

At point P the magnetic field due to a long straight wire carrying a current of 2.0 A is 1.2 µT. How far is P from the wire? (µ0 = 4π × 10^-7 T * m/A)

2.0 cm

At what distance from a long straight wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of Earth's magnetic field of about 5.0 × 10-5 T? (μ0 = 4π × 10^-7 T * m/A)

4

If the frequency of a system undergoing simple harmonic motion doubles, by what factor does the maximum value of acceleration change?

3.78 W/m2

Calculate the light intensity 1.45 m from a light bulb that radiates 100 W equally in all directions.

2L, L, 2L/3

Consider a pipe of length L that is open at both ends. What are the wavelengths of the three lowest-pitch tones produced by this pipe?

4L, 4L/3, 4L/5

Consider a pipe of length L that is open at one end and closed at the other end. What are the wavelengths of the three lowest-pitch tones produced by this pipe?

30 V

Consider a uniform horizontal electric field of 50 N/C directed toward the east. If the electric potential at a given point in the field is 80 V, what is the potential at a point 1.0 m directly east of the point?

80 V

Consider a uniform horizontal electric field of 50 N/C directed toward the east. If the electric potential at a given point in the field is 80 V, what is the potential at a point 1.0 m directly south of that point?

130 V

Consider a uniform horizontal electric field of 50 N/C directed toward the east. If the electric potential measured at a given point is 80 V, what is the potential at a point 1.0 m directly west of that point?

become one-half as strong as initially

Consider an ideal solenoid of length L, N windings, and radius b (L is much longer than b). A current I is flowing through the wire windings. If the length of the solenoid becomes twice as long (to 2L), but all other quantities remained the same, the magnetic field inside the solenoid will

remain the same

Consider an ideal solenoid of length L, N windings, and radius b (L is much longer than b). A current I is flowing through the wire windings. If the radius of the solenoid is doubled to 2b, but all the other quantities remain the same, the magnetic field inside the solenoid will

They have the same period; They have the same frequency

Consider the standing wave on a guitar string and the sound wave generated by the string as a result of this vibration. What do these two waves have in common? (There may be more than one correct choice.)

The thicker wire has one-half the resistance of the thinner wire

Consider two copper wires of equal length. One wire has twice the cross-sectional area of the other. How do the resistances of these two wires compare?

56 m

Crests of an ocean wave pass a pier every 10.0 s. If the waves are moving at 5.6 m/s, what is the wavelength of the ocean waves?

44%

If the frequency of a violin string is to be increased by 20%, what change in tension must be applied?

decrease to one-half

Doubling the capacitance of a capacitor that is holding a constant charge causes the energy stored in that capacitor to

quadruple

Doubling the potential across a given capacitor causes the energy stored in that capacitor to

100%

During a period of high power demand, the voltage output of the power company is reduced by 5.0%. By what percentage is the power in a resistor decreased?

200 J/m^3

Each plate of a parallel-plate air-filled capacitor has an area of 0.0040 m^2, and the separation of the plates is 0.020 mm. An electric field of 8.2 × 10^6 N/C is present between the plates. What is the energy density in the region between the plates?

19 µC/m^2

Each plate of an ideal air-filled parallel-plate capacitor has an area of 0.0020 m2, and the separation of the plates is 0.090 mm. An electric field of 2.1 × 106 N/C is present between the plates. What is the surface charge density on the plates?

False

Electrically neutral objects cannot exert an electrical force on each other, but they can exert a gravitational force on each other

2.5 m/s

Find the speed of an ocean wave whose displacement is given by the equation y = 3.7 cos(2.2x - 5.6t) where x and y are in meters and t is in seconds

0 V

Four point charges of magnitude 6.00 µC and are at the corners of a square 2.00 m on each side. Two of the charges are positive, and two are negative. What is the electric potential at the center of this square, relative to infinity, due to these charges?

0.25 A

Four resistors having resistances of 20 Ω, 40 Ω, 60 Ω, and 80 Ω are connected in series across an ideal 50-V dc source. What is the current through each resistor?

The equivalent resistance is less than that of the smallest resistor

Four unequal resistors are connected in a parallel with each other. Which one of the following statements is correct about this combination?

The equivalent resistance is more than the largest resistance

Four unequal resistors are connected in series with each other. Which one of the following statements is correct about this combination?

I and II

Four waves are described by the following equations, where distances are measured in meters and times in seconds. I. y = 0.12 cos(3x - 21t) II. y = 0.15 sin(6x + 42t) III. y = 0.13 cos(6x + 21t) IV. y = -0.23 sin(3x - 42t) Which of these waves have the same speed?

There is less diffraction with a larger lens than with a smaller lens

Given perfect lenses, what is the main reason that a telescope with a large-diameter objective lens can produce a sharper image than one with a small-diameter lens?

Lower the weight

Grandfather clocks are designed so they can be adjusted by moving the weight at the bottom of the pendulum up or down. Suppose you have a grandfather clock at home that runs fast. Which of the following adjustments of the weight would make it more accurate? (There could be more than one correct choice.

Raise the weight

Grandfather clocks are designed so they can be adjusted by moving the weight at the bottom of the pendulum up or down. Suppose you have a grandfather clock at home that runs slow. Which of the following adjustments of the weight would make it more accurate? (There could be more than one correct choice.)

67 mm

How far from a +50-mm focal length lens, such as is used in many 35-mm cameras, must an object be placed so it will form a real image that is 3.0 times the size of the object?

6.3 × 10^18

How many electrons are necessary to produce 1.0 C of negative charge? (e = 1.60 × 10^-19 C)

120

How many turns should a 10-cm long ideal solenoid have if it is to generate a 1.5-mT magnetic field when 1.0 A of current runs through it? (ȝ0 = 4ʌ × 10-7 T Â m/A)

5.0 C

How much charge must pass by a point in a wire in 10 s for the current in the wire to be 0.50 A?

80 A

How much current must pass through a 400-turn ideal solenoid that is 4.0 cm long to generate a 1.0-T magnetic field at the center? (μ0 = 4π × 10^-7 T * m/A)

1.6¢

How much does it cost to operate a 25-W soldering iron for 8.0 hours if energy costs 8.0¢/kWh?

1.00 eV

How much kinetic energy does a proton gain if it is accelerated, with no friction, through a potential difference of 1.00 V? The proton is 1836 times heavier than an electron, and e = 1.60 × 10^-19 C

14.4 × 10^-19 J

How much work is needed to carry an electron from the positive terminal to the negative terminal of a 9.0-V battery. (e = 1.60 × 10^-19 C , m_electron = 9.11 × 10^-31 kg)

On the Moon, ball B will take longer to complete one cycle than ball A; On the Moon, ball A will execute more vibrations each minute than ball B

Identical balls oscillate with the same period T on Earth. Ball A is attached to an ideal spring and ball B swings back and forth to form a simple pendulum. These systems are now taken to the Moon, where g = 1.6 m/s2, and set into oscillation. Which of the following statements about these systems are true? (There could be more than one correct choice.)

a magnetic field

If a calculated quantity has units of N * s / C * m , that quantity could be

μ0

If a calculated quantity has units of T × m/A, that quantity could be

It moves toward the centerline

If a diffraction grating is heated (without damaging it) and therefore expands, what happens to the angular location of the first-order maximum?

1500 Hz

If a guitar string has a fundamental frequency of 500 Hz, which one of the following frequencies can set the string into resonant vibration?

It moves toward the centerline

If a metal sheet containing a tiny hole is heated (without damaging it) and therefore expands, what happens to the angular location of the first-order diffraction maximum?

virtual and upright

If a object is placed between a convex lens and its focal point, the image formed is

charge

If a quantity you calculated has units of A Â s, what is that quantity?

resistance

If a quantity you calculated has units of kg * m^2 / s * C^2 what is that quantity?

potential

If a quantity you calculated has units of kg * m^2 / s^2 * C , what is that quantity?

potential

If a quantity you calculated has units of Ω * m what is that quantity?

It moves toward the centerline

If a sheet containing a single slit is heated (without damaging it) and therefore expands, what happens to the angular location of the first-order diffraction minimum?

It gets wider

If a sheet containing a single thin slit is heated (without damaging it) and therefore expands, what happens to the width of the central bright diffraction region on a distant screen?

It moves toward the centerline

If a sheet containing two very thin slits is heated (without damaging it), what happens to the angular location of the first-order interference minimum?

the lens could be either a diverging or a converging lens

If a single lens forms a virtual image of an object, then

R/2

If a spherical concave mirror has a radius of curvature R, its focal length is

75 Hz; 500 Hz

If a string fixed at both ends resonates in its fundamental mode with a frequency of 150 Hz, at which of the following frequencies will it not resonate? (There could be more than one correct choice.)

2.3 × 10^7 m/s

If an electron is accelerated from rest through a potential difference of 1500 V, what speed does it reach? (e = 1.60 × 10^-19 C , m_electron = 9.11 × 10^-31 kg)

at the center of curvature.

If an object is placed at the center of curvature of concave mirror, the image formed by the mirror is located

quadruple in magnitude

If the current flowing through a circuit of constant resistance is doubled, the power dissipated by that circuit will

The resolving power doubles.

If the diameter of a radar dish is doubled, what happens to its resolving power assuming that all other factors remain unchanged?

does not change

If the electric field between the plates of a given air-filled capacitor is weakened by removing charge from the plates, the capacitance of that capacitor

It increases to 2.0 cm

In a double-slit experiment, it is observed that the distance between adjacent maxima on a remote screen is 1.0 cm. What happens to the distance between adjacent maxima when the slit separation is cut in half?

4.5mm

In a double-slit experiment, the slit separation is 2.0 mm, and two wavelengths, 750 nm and 900 nm, illuminate the slits. A screen is placed 2.0 m from the slits. At what distance from the central maximum on the screen will a bright fringe from one pattern first coincide with a bright fringe from the other?

red light.

In a double-slit interference experiment you are asked to use laser light of different wavelengths and determine the separation between adjacent maxima. You observe that this separation is greatest when you illuminate the double slit with

are displacement antinodes at each end

In a resonating pipe that is open at both ends, there

is a displacement node at the closed end and a displacement antinode at the open end.

In a resonating pipe that is open at one end and closed at the other end, there

is a displacement node at the closed end and a displacement antinode at the open end

In a resonating pipe that is open at one end and closed at the other, there

It becomes wider

In a single-slit diffraction experiment, the width of the slit through which light passes is reduced. What happens to the width of the central bright fringe in the resulting diffraction pattern?

650 N/m

In a supermarket, you place a 22.3-N (around 5 lb) bag of oranges on a scale, and the scale starts to oscillate at 2.7 Hz. What is the force constant (spring constant) of the spring of the scale?

763nm

In a two-slit experiment using coherent light, the distance between the slits and the screen is 1.10 m, and the distance between the slits is 0.0400 mm. If the second order bright fringe is measured to be 4.20 cm from the centerline on the screen, what is the wavelength of light?

3.09 μm

In a two-slit experiment using coherent light, the distance between the slits and the screen is 1.10 m, and the distance between the slits is 0.100 mm. If the first-order bright fringe is measured to be 3.40 cm from the centerline, what is the wavelength of the light?

1.44 × 10^-5 m

In a two-slit experiment, a third-order bright fringe is observed at an angle of 7.10° away from the centerline. If the wavelength of light is 595 nm, how far apart are the two slits?

214 nm

In a two-slit experiment, the slit separation is 3.00 × 10^-5 m. The interference pattern is created on a screen that is 2.00 m away from the slits. If the 7th bright fringe on the screen is 10.0 cm away from the central fringe, what is the wavelength of the light?

458

In an ideal transformer, how many turns are necessary in a 110-V primary if the 24-V secondary has 100 turns?

higher than the original pitch and increasing as he falls

In many cartoon shows, a character runs off a cliff, realizes his predicament, and lets out a scream. He continues to scream as he falls. If the physical situation is portrayed correctly, from the vantage point of an observer at the foot of the cliff, the pitch of the scream as he falls should be

It will move with increasing speed; It will move with decreasing acceleration

In outer space, a positive charge q is released near a positive fixed charge Q, as shown in the figure. As q moves away from Q, what is true about the motion of q? (There may be more than one correct choice.)

when the kinetic energy is a minimum; when the magnitude of the displacement is a maximum; when the potential energy is a maximum

In simple harmonic motion, when is the magnitude of the acceleration the greatest? (There could be more than one correct choice.)

Yes because the rays that appear to come from a virtual image can be focused by the eye just like those from an object

Is it possible to see a virtual image?

the law of conservation of charge

Kirchhoff's junction rule is a statement of

51.4°

Light enters a substance from air at 30.0° to the normal. It continues within the substance at 23.0° to the normal. What is the critical angle for this substance when it is surrounded by air?

greater than the angle of incidence.

Light enters air from water. The angle of refraction will be

less than the angle of incidence.

Light enters glass from air. The angle of refraction will be

560 μm

Light from a He-Ne laser of wavelength 633 nm passes through a circular aperture. The resulting pattern is observed on a screen 4.0 m behind the aperture, where the width of the central bright circle is 1.1 cm. What is the diameter of the hole?

n1 > n2

Light goes from material having a refractive index of n1 into a material with refractive index n2. If the refracted light is bent away from the normal, what can you conclude about the indices of refraction?

5.0 × 10^14 Hz

Light has wavelength 600 nm in a vacuum. It passes into glass, which has an index of refraction of 1.5. What is the frequency of the light inside the glass? (c = 3.0 × 10^8 m/s)

6.0 × 10^14 Hz

Light having a frequency in vacuum of 6.0 × 10^14 Hz enters a liquid of refractive index 2.0. What is the frequency of the light in this liquid? (c = 3.0 × 10^8 m/s)

300 nm

Light having a wavelength in vacuum of 600 nm enters a liquid of refractive index 2.0. In this liquid, what is the wavelength of the light? (c = 3.0 × 10^8 m/s)

0°

Light in a frozen block of ice reflects off the ice-air interface at the surface of the block. What phase shift does it undergo?

the 6000-line grating

Light of the same wavelength passes through two diffraction gratings. One grating has 4000 lines/cm, and the other one has 6000 lines/cm. Which grating will spread the light through a larger angle in the first-order pattern?

15 mm

Light of wavelength 500 nm illuminates a round 0.50-mm-diameter hole. A screen is placed 6.0 m past the slit. What is the width of the central bright circle on the screen?

0.92 cm

Light of wavelength 610 nm is incident on a slit 0.20 mm wide and the diffraction pattern is viewed on a screen that is 1.5 m from the slit. What is the width on the screen of the central maximum?

180°

Light reflects off the surface of Lake Superior. What phase shift does it undergo?

61°

Light travels from crown glass, with a refractive index of 1.52, into water, having a refractive index of 1.33? The critical angle for this interface is closest to which one of the following angles?

41.8°

Lucite has an index of refraction of 1.50. What is its critical angle if it is in air?

60 V

Measurements show that it takes 0.30 mJ of work to move 5.0-µC of charge from one plate to another of a certain air-filled capacitor while the potential difference between these plates is kept constant. What is the potential difference between the plates of this capacitor?

The distance between the minima increases; The distance between the maxima increases.

Monochromatic coherent light shines through a pair of slits. If the distance between these slits is decreased, which of the following statements are true of the resulting interference pattern? (There could be more than one correct choice.)

The distance between the maxima decreases; The distance between the minima decreases.

Monochromatic coherent light shines through a pair of slits. If the wavelength of the light is decreased, which of the following statements are true of the resulting interference pattern? (There could be more than one correct choice.)

403nm

Monochromatic light is incident on a diffraction grating that is 75 mm wide and ruled with 50,000 lines. The second-order maximum is seen at 32.5°. What is the wavelength of the incident light?

2.8 μm

Monochromatic light of wavelength 500 nm is incident normally on a diffraction grating. If the third-order maximum of the diffraction pattern is observed at 32° from the centerline, what is the distance between the slits of the grating?

T sqrt 6

On the Moon, the acceleration of gravity is g/6. If a pendulum has a period T on Earth, what will its period be on the Moon?

5.1 m

Suppose you wanted to hold up an electron against the force of gravity by the attraction of a fixed proton some distance above it. How far above the electron would the proton have to be?

40 cm

Tan's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and upright, what is the focal length of the mirror?

1.34 m

One of the harmonics of a column of air in a tube that is open at one end and closed at the other has a frequency of 448 Hz, and the next higher harmonic has a frequency of 576 Hz. How long is the tube? The speed of sound in air is 343 m/s

2.8 N

One point charge +Q is placed at the center of a square, and a second point charge -Q is placed at the upper-left corner of the square. It is observed that an electrostatic force of magnitude 2.0 N acts on the positive charge at the center. Now a third charge -Q is placed at the lower-left corner of the square, as shown in the figure. What is the magnitude of the net force that acts on the center charge now?

The wavelength of light is much smaller than the wavelength of radio waves

Radio waves are diffracted by large objects such as buildings, whereas light is not noticeably diffracted. Why is this?

three times as large as his face

Reza's face is 20 cm in front of a concave shaving mirror having a focal length of magnitude 30 cm. How large is the image of his face?

could be smaller than, larger than, or the same size as the actual object, depending on the placement of the object

Single concave spherical mirrors produce images that

You will see a little you, right side up

Sometimes when you look into a curved mirror you see a magnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at the bottom (convex) side of a shiny spoon, what will you see?

The image eventually changes from real to virtual

Starting from very far away, an object is moved closer and closer to a converging lens, eventually reaching the lens. What happens to its image formed by that lens? (There could be more than one correct choice.)

The image gets closer and closer to the lens; The image always remains virtual; The image keeps getting larger and larger

Starting from very far away, an object is moved closer and closer to a diverging lens, eventually reaching the lens. What happens to its image formed by that lens? (There could be more than one correct choice.)

unchanged

Suppose that a sound source is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound will be

in parallel across the source

Suppose you have two capacitors and want to use them to store the maximum amount of energy by connecting them across a voltage source. You should connect them

If you position the object between the mirror and the focal point of the mirror, its image must be upright and virtual.

Suppose you place an object in front of a concave mirror. Which of the following statements must be true? (There could be more than one correct choice.)

2.7 × 10^-3 V

The area of a rectangular loop of wire is 3.6 × 10^-3 m^2. The loop is placed in a uniform magnetic field that changes steadily from 0.20 T to 1.4 T in 1.6 s. The plane of the loop is perpendicular to the direction of the magnetic field. What is the magnitude of the induced emf in that loop?

4.0 × 1026 W

The average intensity of sunlight impinging on Earth is measured to be about 1.4 kW/m2. What is the power of sunlight emitted by the sun? (Earth-Sun distance = 1.5 × 108 km, Earth radius = 6.4 × 103 km)

totally reflected

The critical angle for a beam of light passing from water into air is 48.8°. This means that all light rays with an angle of incidence in the water that is greater than 48.8° will be

34.7°

The critical angle for a substance in air is measured at 53.7°. If light enters this substance from air at 45.0° with the normal, at what angle with the normal will it continue to travel?

40 cm

The focal length of a concave mirror has a magnitude of 20 cm. What is its radius of curvature?

-40 cm

The focal length of a convex mirror is has a magnitude of 20 cm. What is its radius of curvature?

20 A

The following three appliances are connected in parallel across an ideal 120-V dc power source: 1200-W toaster, 650-W coffee pot, and 600-W microwave. If all were operated at the same time what total current would they draw from the source?

3.12 m

The force of attraction that a -40.0 µC point charge exerts on a +108 µC point charge has magnitude 4.00 N. How far apart are these two charges? (k = 8.99 × 10^9 N * m2/C2)

at the same distance behind the mirror as the object is in front of the mirror

The image formed in a plane mirror is

2.0 × 10^8 m/s

The index of refraction of a certain glass is measured to be 1.5. What is the speed of light in that glass? (c = 3.0 × 10^8 m/s)

greater than the angle of incidence

The index of refraction of a type of glass is 1.50, and the index of refraction of water is 1.33. If light enters water from this glass, the angle of refraction will be

1130

The inductance of a solenoid that is 16.0 cm long and has a cross-sectional area of 1.00 × 10^-4 m^2 is 1.00 mH. How many turns of wire does this solenoid have? (μ0 = 4π × 10^-7 T * m/A)

28 dB

The intensity at a distance of 6.0 m from a source that is radiating equally in all directions is 6.0 × 10-10 W/m2. What is the intensity level in dB? The threshold of human hearing is 1.0 × 10-12 W/m2.

68 dB

The intensity level is 65 dB at a distance 5.00 m from a barking dog. What would be a reasonable estimate for the intensity level if two identical dogs very close to each other were barking? You can ignore any interference effects

d/sqrt2

The intensity of the waves from a point source at a distance d from the source is I. At what distance from the sources is the intensity equal to 2I?

I/4

The intensity of the waves from a point source at a distance d from the source is I. What is the intensity at a distance 2d from the source?

It is 1/2 as large

The length of a certain wire is doubled and at the same time its radius is also doubled. What is the new resistance of this wire?

It it 8 times as large

The length of a certain wire is doubled and at the same time its radius is reduced by a factor of 2. What is the new resistance of this wire?

It is 2 times as large

The length of a certain wire is doubled while its radius is kept constant. What is the new resistance of this wire?

It is reduced by a factor of 4

The length of a certain wire is kept same while its radius is doubled. What is the new resistance of this wire?

It does not change

The length of a certain wire is kept same while its radius is doubled. What is the new resistivity of this wire?

400 Hz

The lowest tone to resonate in a pipe of length L that is closed at one end but open at the other end is 200 Hz. Which one of the following frequencies will not resonate in that pipe?

900 Hz

The lowest tone to resonate in pipe of length L that is open at both ends is 200 Hz. Which one of the following frequencies will not resonate in the same pipe?

8 μT

The magnetic field at a distance of 2 cm from a long straight current-carrying wire is 4 μT. What is the magnetic field at a distance of 1 cm from this wire?

2 μT

The magnetic field at a distance of 2 cm from a long straight current-carrying wire is 4 μT. What is the magnetic field at a distance of 4 cm from this wire?

0°

The maximum torque on a flat current-carrying loop occurs when the angle between the plane of the loop's area and the magnetic field vector is

The power increases to 2.2 kW

The nichrome heating element in an electric drier operates on 240 V and generates heat at the rate of 2.0 kW. The heating element shorts out and, in repairing it, the repairman shortens the nichrome wire by 10%. (Assume the temperature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element?

14.3 m/s^2

The period of a simple pendulum that is 1.00 m long on another planet is 1.66 s. What is the acceleration due to gravity on this planet if the mass of the pendulum bob is 1.5 kg?

must decrease

The plates of a parallel-plate capacitor are maintained with constant potential by a battery as they are pulled apart. During this process, the amount of charge on the plates

It decreases

The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they are pulled apart. What happens to the strength of the electric field between the plates during this process?

0.129s

The position of an air-track cart that is oscillating on a spring is given by the equation x = (12.4 cm) cos[(6.35 s-1)t]. At what value of t after t = 0.00 s is the cart first located at x = 8.47 cm?

5.46 rad/s

The position of an object that is oscillating on a spring is given by the equation x = (17.4 cm) cos[(5.46 s-1)t]. What is the angular frequency for this motion?

12 V

The potential (relative to infinity) at the midpoint of a square is 3.0 V when a point charge of +Q is located at one of the corners of the square. What is the potential (relative to infinity) at the center when each of the other corners is also contains a point charge of +Q?

1000 V/m

The potential difference between the plates of an ideal air-filled parallel-plate capacitor with a plate separation of 6.0 cm is 60 V. What is the strength of the electric field between the plates of this capacitor?

8 A

The primary coil of an ideal transformer has 100 turns and its secondary coil has 400 turns. If the ac current in the secondary coil is 2 A, what is the current in its primary coil?

480 V

The primary coil of an ideal transformer has 100 turns and its secondary coil has 400 turns. If the ac voltage applied to the primary coil is 120 V, what voltage is present in its secondary coil?

8 A

The primary coil of an ideal transformer has 600 turns and its secondary coil has 150 turns. If the current in the primary coil is 2 A, what is the current in its secondary coil?

50 A

The primary of an ideal transformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary to be

200 V

The primary of an ideal transformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

100 W

The primary of an ideal transformer has 100 turns and its secondary has 200 turns. Neglecting frictional losses, if the power input to the primary is 100 W, we can expect the power output of the secondary to be

2.3

The pupil of a person's eye changes from a diameter of 3.5 mm to 1.5 mm as the illumination is increased. By what factor does the minimum angle of resolution change?

1.7 mV

The resistivity of a 1.0 m long copper wire is 1.72 × 10-8 Ω * m and its cross sectional area is 2.0 × 10-6 m^2. If the wire carries a current of 0.20 A, what is the voltage across the wire?

2.4 × 10^18

The resistivity of gold is 2.44 × 10-^8 Ω * m at a temperature of 20°C. A gold wire that is 0.50 mm in diameter and 44 cm long carries a current of 380 mA. How many electrons each second pass a given cross section of the wire at 20°C? (e = 1.60 × 10^-19 C)

0.0112 Ω

The resistivity of the material of a wire is 1.76 × 10-8 Ω * m. If the diameter of the wire is 2.00 mm and its length is 2.00 m, what is its resistance?

0.625 A

The secondary coil of an ideal neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What current does the primary draw?

236 Hz

The sound from the whistle of a truck moving at 17.0 m/s toward a cliff reflects from the cliff and is heard by the driver of the truck. When it is parked at the side of the road, the whistle from the truck produces sound of frequency 2.267 kHz. As observed by the driver of the truck, what is the change in frequency the sound from the whistle due to the reflection? The speed of sound is 343 m/s

1.4

The speed of light in a certain material is measured to be 2.2 × 10^8 m/s. What is the index of refraction of this material? (c = 3.0 × 10^8 m/s)

24°

The speed of light in a material is 0.41 c. What is the critical angle of a light ray at the interface between the material and a vacuum?

7.58 m

The speed of sound in steel is 5000 m/s. What is the wavelength of a sound wave of frequency 660 Hz in steel?

1.30

The wavelength of light in a thin film is 360 nm and the wavelength of light in vacuum is 469 nm. What is the index of refraction for the film?

1.6 N

Three identical 3.0-µC charges are placed at the vertices of an equilateral triangle that measures 30 cm on a side. What is the magnitude of the electrostatic force on any one of the charges? (k =9.0 × 10^9 N * m^2/C^2)

Q/3

Three identical capacitors are connected in parallel to a potential source (battery). If a charge of Q flows into this combination, how much charge does each capacitor carry?

Q

Three identical capacitors are connected in series across a potential source (battery). If a charge of Q flows into this combination of capacitors, how much charge does each capacitor carry?

0.189 N

Three point charges are located on the x-axis at the following positions: Q1 = +2.00 µC is at x = 1.00 m, Q2 = +3.00 µC is at x = 0.00, and Q3 = -5.00 µC is at x = -1.00 m. What is the magnitude of the electric force on Q2?

54 kV

Two +6.0-µC charges are placed at two of the vertices of an equilateral triangle having sides 2.0 m long. What is the electric potential at the third vertex, relative to infinity, due to these charges?

52 µC

Two 10¢ coins (dimes) carrying identical charges are lying 2.5 m apart on a table. If each of these coins experiences an electrostatic force of magnitude 2.0 N due to the other coin, how large is the charge on each coin?

11,000 V

Two 3.0 µC charges lie on the x-axis, one at the origin and the other at 2.0 m. What is the potential (relative to infinity) due to these charges at a point at 6.0 m on the x-axis?

1.5 MV

Two 5.0-µC point charges are 12 cm apart. What is the electric potential (relative to infinity) of this combination at the point where the electric field due to these charges is zero?

a whole number of wavelengths

Two beams of coherent light start out at the same point in phase and travel different paths to arrive at point P. If the maximum constructive interference is to occur at point P, the two beams must travel paths that differ by

an odd number of half-wavelengths

Two beams of coherent light start out at the same point in phase and travel different paths to arrive at point P. If the maximum destructive interference is to occur at point P, the two beams must travel paths that differ by

5.8 × 10^-25 N

Two electrons are 20.0 mm apart at closest approach. What is the magnitude of the maximum electric force that they exert on each other?

140 nC

Two equally charged tiny spheres of mass 1.0 g are placed 2.0 cm apart. When released, they begin to accelerate away from each other at 414 m/s^2. What is the magnitude of the charge on each sphere, assuming only that the electric force is present?

2C

Two ideal parallel-plate capacitors are identical in every respect except that one has twice the plate area of the other. If the smaller capacitor has capacitance C, the larger one has capacitance

278 Hz

Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 8.00 m. A person is standing 12.0 m away from the wall, equidistant from the loudspeakers. When the person moves 3.00 m parallel to the wall, she experiences destructive interference for the second time. What is the frequency of the sound? The speed of sound in air is 343 m/s.

2.7 × 10^-8 C/m^2

Two large parallel plates are separated by 1.0 mm of air. If the potential difference between them is 3.0 V, what is the magnitude of their surface charge densities? (İ0 = 8.85 × 10^-12 C2/N * m2)

of the same frequency, and maintain a constant phase difference

Two light sources are said to be coherent if they are

12.0 μN/m

Two long parallel wires are 0.400 m apart and carry currents of 4.00 A and 6.00 A. What is the magnitude of the force per unit length that each wire exerts on the other wire? (μ0 = 4π × 10^-7 T * m/A)

F

Two long parallel wires are placed side-by-side on a horizontal table and carry current in the same direction. The current in one wire is 20 A, and the current in the other wire is 5 A. If the magnetic force on the 20-A wire has magnitude F, what is the magnitude of the magnetic force on the 5-A wire? No external magnetic fields are present.

the wires push away from each other

Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in opposite directions,

the wires pull toward each other

Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in the same direction,

16 cm from the 20 A wire

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 20 cm. At what point between the two wires do they produce the same strength magnetic field?

points downward

Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in opposite directions. The wire on your right carries current directly toward you, and the wire on your left carries current directly away from you. From your point of view, the magnetic field at a point exactly midway between the two wires

2.7 × 10^-5 N repulsive

Two long parallel wires that are 0.30 m apart carry currents of 5.0 A and 8.0 A in the opposite direction. Find the magnitude of the force per unit length that each wire exerts on the other wire and indicate if the force is attractive or repulsive. (μ0 = 4π × 10^-7 T × m/A)

6.7 µT

Two long parallel wires that are 0.40 m apart carry currents of 10 A in opposite directions. What is the magnetic field strength in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other?

1720 Hz; 2030 Hz

Two loudspeakers placed 6.00 m apart are driven in phase by an audio oscillator having a frequency range from 1595 Hz to 2158 Hz. A point P is located 4.70 m from one loudspeaker and 3.60 m from the other speaker. The speed of sound in the room is 344 m/s. At what frequency (or frequencies) of the oscillator does the sound reaching point P interfere destructively? (There could be more than one correct choice.)

78 nJ

Two parallel circular plates, each with a radius of 7.0 mm and carrying equal-magnitude surface charge densities of ±3.0 µC/m^2, are separated by a distance of 1.0 mm with only air between them. How much energy is stored in these plates?

5.6 µC

Two parallel plates that are initially uncharged are separated by 1.7 mm, have only air between them, and each have surface areas of 16 cm^2. How much charge must be transferred from one plate to the other if 1.9 J of energy are to be stored in the plates?

60°

Two plane mirrors make an angle of 30° with each other. A light ray enters the system and is reflected once off of each mirror. Through what angle is the ray turned?

1/16 N

Two point charges each experience a 1-N electrostatic force when they are 2 cm apart. If they are moved to a new separation of 8 cm, what is the magnitude of the electric force on each of them?

It remains the same

Two point charges, Q1 and Q2, are separated by a distance R. If the magnitudes of both charges are doubled and their separation is also doubled, what happens to the electrical force that each charge exerts on the other one?

It remains the same

Two point charges, Q1 and Q2, are separated by a distance R. If the magnitudes of both charges are halved and their separation is also halved, what happens to the electrical force that each charge exerts on the other one?

Their kinetic energy keeps decreasing; Their electric potential energy keeps increasing

Two protons are fired toward each other in a particle accelerator, with only the electrostatic force acting. Which of the following statements must be true about them as they move closer together? (There could be more than one correct choice.)

Their electric potential energy keeps decreasing; Their kinetic energy keeps increasing; Their acceleration keeps decreasing

Two protons are released from rest, with only the electrostatic force acting. Which of the following statements must be true about them as they move apart? (There could be more than one correct choice.)

It could either increase or decrease

Two pure tones are sounded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is increased?

5.1 min

Two radio antennas are 10 km apart on a north-south axis on high mountain tops at the seacoast. The antennas broadcast identical AM radio signals, in phase, at a frequency of 4.70 MHz. A steamship, 200 km offshore, travels toward the north at 15 km/h and passes east of the antennas. A radio on board the ship is tuned to the broadcast frequency. The reception of the radio signal on the ship is a maximum at a given instant. How much later until the next occurrence of maximum reception? (c = 3.00 × 10^8 m/s)

50°

Two radio antennas are 130 m apart on a north-south line. The two antennas radiate in phase at a frequency of 3.6 MHz. All radio measurements are made far from the antennas. What is the smallest angle, reckoned east of north from midway between the antennas, at which constructive interference of two radio waves occurs? (c = 3.00 × 10^8 m/s)

4

When a dielectric material is introduced between the plates of a parallel-plate capacitor and completely fills the space, the capacitance increases by a factor of 4. What is the dielectric constant of the material that was introduced?

36.2 m/s

Two steel wires are stretched with the same tension. The first wire has a diameter of 0.610 mm and the second wire has a diameter of 0.910 mm. If the speed of waves traveling along the first wire is 54.0 m/s, what is the speed of waves traveling along the second wire?

825 Hz

Two strings both vibrate at exactly 819 Hz. The tension in one of them is then increased slightly. As a result, six beats per second are heard when both strings vibrate. What is the new frequency of the string that was tightened?

The force on A is exactly equal to the force on B

Two tiny beads are 25 cm apart with no other charges or fields present. Bead A carries 10 µC of charge and bead B carries 1 µC. Which one of the following statements is true about the magnitudes of the electric forces on these beads?

890 nC

Two tiny beads, each of mass 3.2 g, carry equal-magnitude charges. When they are placed 6.4 cm apart and released in outer space, they begin to accelerate toward each other at 538 m/s2. What is the magnitude of the charge on each bead? (k = 1/4ʌİ0 = 9.0 × 109 N Â m2/C2)

2.4 × 10^-8 C

Two tiny particles carrying like charges of the same magnitude are 1.0 mm apart. If the electric force on one of them is 5.0 N, what is the magnitude of the charge on each of these particles?

25.2 × 10^6 N/C directed towards the negative charge

Two tiny particles having charges +20.0 uC and -8.00 uC are separated by a distance of 20.0 cm. What are the magnitude and direction of electric field midway between these two charges? (k = 9.0 × 109 N Â m2/C2)

45.8 cm

Two tiny particles having charges of +5.00 µC and +7.00 µC are placed along the x-axis. The +5.00-µC particle is at x = 0.00 cm, and the other particle is at x = 100.00 cm. Where on the x-axis must a third charged particle be placed so that it does not experience any net electrostatic force due to the other two particles?

-2.99 m

Two tiny particles having charges of +7.00 µC and -9.00 µC are placed along the y-axis. The +7.00-µC particle is at y = 0.00 cm, and the other particle is at y = 40.00 cm. Where must a third charged particle be placed along the y-axis so that it does not experience any net electric force due to the other two particles?

82 Hz

Two tuning forks have frequencies of 440 and 522 Hz. What is the beat frequency if both are sounding simultaneously?

sphere #1 carries positive charge and #2 carries negative charge

Two uncharged metal spheres, #1 and #2, are mounted on insulating support rods. A third metal sphere, carrying a positive charge, is then placed near #2. Now a copper wire is momentarily connected between #1 and #2 and then removed. Finally, sphere #3 is removed. In this final state

725 nm

Two very flat glass plates, 16 cm long, are in contact at one end and separated by 0.020 mm at the other end. The space between the plates is occupied by oil with index of refraction 1.45. The refractive index of the glass plates is 1.55. The plates are illuminated at normal incidence with monochromatic light, and fringes are observed. If the spacing of the dark fringes is 2.0 mm, what is the wavelength of the monochromatic light?

4.8 × 10^-19 J

Two very large parallel metal plates, separated by 0.20 m, are connected across a 12-V source of potential. An electron is released from rest at a location 0.10 m from the negative plate. When the electron arrives at a distance 0.050 m from the positive plate, how much kinetic energy has the electron gained? (e = 1.60 × 10^-19 C)

1.08 × 10^5 V

Two very small +3.00-ȝC charges are at the ends of a meter stick. Find the electric potential (relative to infinity) at the center of the meter stick.

The balls always have accelerations of equal magnitude; The speed of the balls keeps increasing

Two very small plastic balls of equal mass are released from rest. One of them carries +10 µC of excess charge and the other one carries +1µC of charge. No other charges or fields are present. Which of the following statements are true about them as they move away from each other? (There may be more than one correct choice.)

-period -wavelength -frequency

What characteristics of a sound wave are related to the "pitch" of a musical note? (There could be more than one correct choice.)

200 µC

What charge accumulates on the plates of a 2.0-ȝF air-filled capacitor when it is charged until the potential difference across its plates is 100 V?

When the electric field due to one is a maximum, the electric field due to the other is also a maximum, and this relation is maintained as time passes

What do we mean when we say that two light rays striking a screen are in phase with each other?

9.6 × 10^7 C

What is the charge on 1.0 kg of protons? (e = 1.60 × 10^-19 C, m_proton = 1.67 × 10^-27 kg)

0.045 N/m

What is the force per meter on a straight wire carrying 5.0 A when it is placed in a magnetic field of 0.020 T so that the wire makes an angle of 27° with respect to the magnetic field lines.

1.8 × 10^-4 rad

What is the limiting angle of resolution for a lens of radius 2.0 mm when viewing with light having a wavelength of 600 nm?

6.9 × 10^6 N/C

What is the magnitude of a the vertical electric field that will balance the weight of a plastic sphere of mass 2.1 g that has been charged to -3.0 nC? (k = = 9.0 × 109 N * m2/C2)

180,000 N/C

What is the magnitude of the electric field 2.8 cm from a tiny object that carries an excess charge of -16 nC? (k = 1/4ʌİ0 = 9.0 × 109 N Â m2/C2)

111 nm

What is the minimum thickness of a soap bubble film with refractive index 1.38 that results in a constructive interference in the reflected light if this film is illuminated by a beam of light of wavelength 610 nm?

1000:1

What is the ratio of the intensities of two sounds with intensity levels of 70 dB and 40 dB?

41.9 µH

What is the self-inductance of an ideal solenoid that is 300 cm long with a cross-sectional area of 1.00 × 10^-4 m^2 and has 1000 turns of wire? (μ0 = 4π × 10^-7 T * m/A)

1.42 μm

What is the slit spacing of a diffraction grating necessary so that 600-nm light will produce a first order principal maximum at 25.0° away from the centerline?

1320 V

What potential difference is required to cause 4.00 A to flow through a resistance of 330 Ω?

25 nC

When 1.0-µC point charge is 15 m from a second point charge, the force each one experiences a force of 1.0 µN. What is the magnitude of the second charge?

23 A

When 5.0 A at 110 V flows in the primary of an ideal transformer, how many amps at 24 V can flow in the secondary?

250 W

When 5.00 A is flowing through an 10.0-Ω device, how much power is being dissipated in the device?

800 µJ

When a 4-ȝF capacitor has a potential drop of 20 V across its plates, how much electric potential energy is stored in this capacitor?

a 180° phase change in the reflected beam

When a beam of light that is traveling in air is reflected by a glass surface, there is

no phase change in the reflected beam

When a beam of light that is traveling in glass strikes an air boundary at the surface of the glass, there is

is unaffected

When a beam of light, originally traveling in air, enters a piece of glass having an index of refraction of 3/2, its frequency

is reduced to 2/3 its original value

When a beam of light, originally traveling in air, enters a piece of glass having an index of refraction of 3/2, its speed

is reduced to 2/3 its original value

When a beam of light, originally traveling in air, enters a piece of glass having an index of refraction of 3/2, its wavelength

If we double the charges on the plates to ±20 µC, the capacitance of the capacitor will not change; If we double the charges on the plates to ±20 µC, the potential difference across the plates will also double

When a certain capacitor carries charges of ±10 µC on its plates, the potential difference cross the plates is 25 V. Which of the following statements about this capacitor are true? (There could be more than one correct choice.)

v sqrt 2

When a certain string is under tension T, the speed of a wave in the string is v. What will be the speed of a wave in the string if the tension is increased to 2T without changing the mass or length of the string?

only electrons

When a current flows through a metal wire, the moving charges are

both positive and negative ions

When a current flows through an ionic liquid such as salty water, the moving charges are

633 nm

When light illuminates a diffraction grating with 7000 lines per centimeter, its second order maximum is at 62.4°. What is the wavelength of the light?

its velocity and wavelength change, but its frequency does not change.

When light travels from air into water,

increases by a factor of 16

When the current through a resistor is increased by a factor of 4, the power dissipated by the resistor

7.6 × 10^-12 F

When the potential difference between the plates of an ideal air-filled parallel plate capacitor is 35 V, the electric field between the plates has a strength of 750 V/m. If the plate area is 4.0 × 10^-2 m2, what is the capacitance of this capacitor?

The potential difference across each capacitor is the same; The capacitor with the largest capacitance has the most charge.

When two or more different capacitors are connected in parallel across a potential source (battery), which of the following statements must be true? (There could be more than one correct choice.)

the potential drop is always the same across each resistor

When unequal resistors are connected in parallel in a circuit,

the current flowing in each is the same

When unequal resistors are connected in series across an ideal battery,

double

When you double the number of windings in an ideal solenoid while keeping all other parameters (radius, length and current) fixed, the magnetic field at the center of the solenoid will

None of the above choices are correct; [The image is always inverted.; The image is always upright; The image is always virtual; The image is always real]

Which of following statements about the image formed by a single converging lens are true? (There could be more than one correct choice.)

The image is always virtual; The image is always upright

Which of following statements about the image formed by a single diverging lens are true? (There could be more than one correct choice.)

introduce a dielectric material between the plates; decrease the separation between the plates

Which of the following changes will increase the capacitance of a parallel-plate capacitor? (There could be more than one correct choice.)

Increase the wavelength of the light used.

Which of the following changes would increase the separation between the bright fringes in the diffraction pattern formed by a diffraction grating?

A convex mirror always produces a virtual image; A convex mirror always produces an upright image

Which of the following statements about spherical mirrors is correct? (There could be more than one correct choice.)

converging lenses; convex lenses

Which of the following terms describe lenses that are thicker at the center than at the edges? (There could be more than one correct choice.)

concave lenses; diverging lenses

Which of the following terms describe lenses that are thinner at the center than at the edges? (There could be more than one correct choice.)

1

Which one of the following numbers is the correct magnification produced by a plane mirror?

1 V * A

Which one of the following quantities is equivalent to 1 W?

1 V/A

Which one of the following quantities is equivalent to 1 Ω?

virtual and upright

Which one of the following sets of characteristics describes the image formed by a plane mirror?

The north pole of a magnet points towards Earth's geographic north pole

Which one of the following statements is correct?

A diverging lens always produces a virtual upright image

Which statement about a single thin lens is correct?

A virtual image cannot be formed on a screen

Which statements about images are correct? (There could be more than one correct choice.)

The electric potential is constant over the surface; The electric field is perpendicular to the surface

Which statements must be true about the surface of a charged conductor in which no charge is moving? (There could be more than one correct choice.)

The waves spread out as they travel

Why does the intensity of waves from a small source decrease with the square of the distance from the source?

blue, because of its shorter wavelength

With what color light would you expect to be able to see the finest detail when using a microscope?

3 cm × 5 cm

You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the largest possible resistance, you should attach the leads to the opposite faces that measure

5 cm × 8 cm

You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the smallest possible resistance, you should attach the leads to the opposite faces that measure

You are beautiful being

You are no foul creature

I believe in you

You can do it!

one-fourth its original value

You double your distance from a sound source that is radiating equally in all directions. What happens to the intensity of the sound? It reduces to

The 50-W bulb glows more brightly than the 100-W bulb

You obtain a 100-W light bulb and a 50-W light bulb. Instead of connecting them in the normal way, you devise a circuit that places them in series across normal household voltage. If each one is an incandescent bulb of fixed resistance, which statement about these bulbs is correct?

Just a few days/hours! :D

You're almost done

You're tea-riffic

You're not a failure

1.29 s

A 0.150-kg air track cart is attached to an ideal spring with a force constant (spring constant) of 3.58 N/m and undergoes simple harmonic oscillations. What is the period of the oscillations?

83 m/s^2

A 0.16-kg block on a horizontal frictionless surface is attached to an ideal spring whose force constant (spring constant) is 360 N/m. The block is pulled from its equilibrium position at x = 0.000 m to a position x = +0.080 m and is released from rest. The block then executes simple harmonic motion along the horizontal x-axis. When the position is x = -0.037 m, what is the acceleration of the block?

24.1 N/m

A 0.250-kg stone is attached to an ideal spring and undergoes simple harmonic oscillations with a period of 0.640 s. What is the force constant (spring constant) of the spring?

0.90 J

A 0.39-kg block on a horizontal frictionless surface is attached to an ideal spring whose force constant (spring constant) is 570 N/m. The block is pulled from its equilibrium position at x = 0.000 m to a displacement x = +0.080 m and is released from rest. The block then executes simple harmonic motion along the horizontal x-axis. When the position of the block is x = 0.057 m, its kinetic energy is closest to

0.646 J

A 1.53-kg piece of iron is hung by a vertical ideal spring. When perturbed slightly, the system is moves up and down in simple harmonic oscillations with a frequency of 1.95 Hz and an amplitude of 7.50 cm. If we choose the total potential energy (elastic and gravitational) to be zero at the equilibrium position of the hanging iron, what is the total mechanical energy of the system?

36 ms

A 10-gram wire that is 6.0 m long is under tension. When a transverse wave of frequency 280 Hz travels along the wire, its wavelength is 0.60 m,and its amplitude is 8.4 mm. How much time does it take for a crest of the transverse wave to travel the length of the wire?

2.5 rad/s

A 2.0-kg block on a frictionless table is connected to two springs whose opposite ends are fixed to walls, as shown in the figure. The springs have force constants (spring constants) k1 and k2. What is the oscillation angular frequency of the block if k1= 7.6 N/m and k2 = 5.0 N/m?

12 Hz

A 25-g string is stretched with a tension of 43 N between two fixed points 12 m apart. What is the frequency of the second harmonic?

3.35 s

A 3.42-kg stone hanging vertically from an ideal spring on the earth undergoes simple harmonic motion at a place where g = 9.80 m/s2. If the force constant (spring constant) of the spring is 12 N/m, find the period of oscillation of this setup on a planet where g = 1.60 m/s2.

4.4s

A 34kg child on an 18kg swing set swings back and forth through small angles. If the length of the very light supporting cables for the swing is 4.9m, how long does it take for each complete back-and-forth swing? Assume the child and swing set are very small compared to the length of the cables.

15 N/m

A 4.8-kg block attached to an ideal spring executes simple harmonic motion on a frictionless horizontal surface. At time t = 0.00 s, the block has a displacement of -0.90 m, a velocity of -0.80 m/s, and an acceleration of +2.9 m/s 2. The force constant (spring constant) of the spring is closest to

710 N

A 90-gram wire that is 1.0 m long is under tension. When a transverse wave of frequency 890 Hz travels down the wire, its wavelength is 0.10 m and its amplitude is 6.5 mm. What is the tension in the wire?

890 kg

A 92-kg man climbs into a car with worn out shock absorbers, and this causes the car to drop down 4.5 cm. As he drives along he hits a bump, which starts the car oscillating at an angular frequency of 4.52 rad/s. What is the mass of the car?

2.38cm

A Christmas ornament made from a thin hollow glass sphere hangs from a small hook at its surface. It is observed to oscillate with a frequency of 2.50 Hz in a city where g = 9.80 m/s2. What is the radius of the ornament? The moment of inertia of a hollow sphere of mass M and radius R about a point on its edge is 5MR2/3.

T sqrt 2

A ball is attached to an ideal spring and oscillates with a period T. If the mass of the ball is doubled, what is the new period?

A & D

A ball swinging at the end of a massless string, as shown in the figure, undergoes simple harmonic motion. At what point (or points) is the magnitude of the instantaneous acceleration of the ball the greatest? (pic)

0.00 J

A ball vibrates back and forth from the free end of an ideal spring having a force constant (spring constant) of 20 N/m. If the amplitude of this motion is 0.30 m, what is the kinetic energy of the ball when it is 0.30 m from its equilibrium position?

4.7 kg

A block attached to an ideal spring of force constant (spring constant) 15 N/m executes simple harmonic motion on a frictionless horizontal surface. At time t = 0 s, the block has a displacement of -0.90 m, a velocity of -0.80 m/s, and an acceleration of +2.9 m/s2 . The mass of the block is closest to:

3.2 × 10^-3

A certain glass window reduces the intensity level of the sound from 72 dB to 47 dB. By what factor is the acoustic power reduced by this glass window?

190 m/s

A crane lifts a 2500-kg beam at a steady rate of 15 cm/s using a steel cable whose mass per unit length is 0.65 kg/m. What is the speed of transverse waves on this cable?

56 dB

A crying baby emits sound with an intensity of 8.0 × 10-8 W/m2. Calculate a reasonable estimate for the intensity level from a set of quintuplets (five babies), all crying simultaneously at the same place? The lowest detectable intensity is 1.0 × 10-12 W/m2.

30,7000

A guitar string is set into vibration with a frequency of 512 Hz. How many oscillations does it undergo each minute?

1.3 Hz

A leaky faucet drips 40 times in 30s. What is the frequency of the dripping?

It could be either 556 Hz or 552 Hz

A music tuner uses a 554-Hz C# tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrument?

0.767 s

A package is oscillating on a Spring scale w/ a period of 4.6 s. At time t= 0.00 s the package has zero speed and is at x= 8.3 cm. At what time after t= 0.0s will the package first be at x= 4.15 cm?

The period increases

A pendulum of length L is suspended from the ceiling of an elevator. When the elevator is at rest the period of the pendulum is T. How does the period of the pendulum change when the elevator moves downward with constant acceleration?

The period does not change

A pendulum of length L is suspended from the ceiling of an elevator. When the elevator is at rest the period of the pendulum is T. How does the period of the pendulum change when the elevator moves upward with constant velocity?

The period becomes infinite because the pendulum would not swing

A pendulum of length L is suspended from the ceiling of an elevator. When the elevator is at rest the period of the pendulum is T. How would the period of the pendulum change if the supporting chain were to break, putting the elevator into freefall?

4.11s

A pendulum that was originally erected by Foucault at the Pantheon in Paris for the Paris Exhibition in 1851 was restored in 1995. It has a 28.0-kg sphere suspended from a 67.0-m light cable. How long would it take for the bob in this pendulum to move from the position of maximum displacement down to the equilibrium point?

520 m/s

A piano wire of linear mass density 0.0050 kg/m is under a tension of 1350 N. What is the wave speed in this wire?

9000 Hz

A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with a frequency of 39.6 kHz. A car is approaching him at a speed of 35.0 m/s. The wave is reflected by the car and interferes with the emitted sound producing beats. What is the frequency of the beats when the speed of sound in air is 343 m/s?

f

A simple harmonic oscillator oscillates with frequency f when its amplitude is A. If the amplitude is now doubled to 2A, what is the new frequency?

The period of the pendulum would increase but the period of the spring would stay the same

A simple pendulum and a mass oscillating on an ideal spring both have period T in an elevator at rest. If the elevator now accelerates downward uniformly at 2 m/s2, what is true about the periods of these two systems?

Both periods would remain the same

A simple pendulum and a mass oscillating on an ideal spring both have period T in an elevator at rest. If the elevator now moves downward at a uniform 2 m/s, what is true about the periods of these two systems?

T/sqrt3

A simple pendulum has a period T on Earth. If it were used on Planet X, where the acceleration due to gravity is 3 times what it is on Earth, what would its period be?

T

A simple pendulum having a bob of mass M has a period T. If you double M but change nothing else, what would be the new period?

The new period is less than T

A simple pendulum that consists of a small ball of mass m and a massless wire of length L swings with a period T. Suppose now that the mass is rearranged so that mass of the ball was reduced but the mass of the wire was increased, with the total mass remaining m and the length being L. What is true about the new period of swing? (There could be more than one correct choice.)

15 mm

A string that is 0.15 m long and fixed at both ends is vibrating in its n = 5 harmonic. The sound from this string excites a pipe that is 0.82 m long and open at both ends into its second overtone resonance. What is the distance between a node and an adjacent antinode, in the string? The speed of sound in air is 345 m/s.

590 Hz

A string that is 0.26 m long is vibrating in its n = 6 harmonic. The sound from this string excites a pipe that is 0.88 m long and open at both ends into its second overtone resonance. What is the common resonant frequency of the string and the pipe? The speed of sound in air is 345 m/s

27 Hz

A string that is 2.0 meters long is fixed at both ends and tightened until the wave speed is 18 m/s. What is the frequency of the standing wave shown in the figure? (pic)

0.124m

A thin hoop is supported in a vertical plane by a nail. What should the radius of the hoop be in order for it to have a period of oscillation of 1.00 s? The moment of inertia of a hoop of mass M and radius R about a point on its rim is 2MR2.

439 Hz

A train is traveling away from you at 120 km/h. It blows its whistle, and you hear a tone of 0.400 kHz. Take the speed of sound to be 340 m/s. What frequency does the whistle actually produce?

0.00026 Hz

A tsunami, an ocean wave generated by an earthquake, propagates along the open ocean at 700 km/hr and has a wavelength of 750 km. What is the frequency of the waves in such a tsunami?

3.74 m/s^2

An astronaut has landed on Planet N-40 and conducts an experiment to determine the acceleration due to gravity on that planet. She uses a simple pendulum that is 0.640 m long and measures that 10 complete oscillations 26s. What is the gravity on Planet N-40?

0.307 m/s^2

An astronaut has landed on an asteroid and conducts an experiment to determine the acceleration of gravity on that asteroid. He uses a simple pendulum that has a period of oscillation of 2.00 s on Earth and finds that on the asteroid the period is 11.3 s. What is the acceleration of gravity on that asteroid?

200 km

An earthquake generates three kinds of waves: surface waves (L-waves), which are the slowest and weakest, shear (S) waves, which are transverse waves and carry most of the energy, and pressure (P) waves, which are longitudinal waves and are the fastest. The speed of P waves is approximately 7 km/s, and that of S waves is about 4 km/s. People do not generally feel the P waves, but animals seem to be sensitive to them. If a person reports that her dog started barking 20 seconds "before the earthquake," then approximately how far was the origin of the earthquake?

double the force constant (spring constant) of the spring

An object attached to an ideal spring executes simple harmonic motion. If you want to double its total energy, you could

at either A or B

An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when its elastic potential energy is a maximum?

Midway between A and B

An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when its elastic potential energy is a minimum?

midway between A and B

An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when its kinetic energy is a maximum?

At either A or B

An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when its kinetic energy is a minimum?

4.8 m

An object undergoing simple harmonic motion has a maximum displacement of 6.2 m at t = 0.00 s. If the angular frequency of oscillation is 1.6 rad/s, what is the object's displacement when t = 3.5s?

Increase by a factor of 2

If both the mass of a simple pendulum and its length are doubled, the period will:

2

If the amplitude of the motion of a simple harmonic oscillator is doubled, by what factor does the max speed of the oscillator change?

4

If the angular frequency of the motion of a simple harmonic oscillator is doubled, by what factor does the maximum acceleration of the oscillator change?

88 dB

If the intensity level by 15 identical engines in a garage is 100 dB, what is the intensity level generated by each one of these engines?

6.65 s

In 1851 Jean Bernard Leon Foucault demonstrated the rotation of the earth using a pendulum 11.0 m long, which was set up in the Paris Observatory. How long would it have taken for Foucault's pendulum to make one complete swing back to its starting point if g = 9.81 m/s2 at the observatory?

when the magnitude of the acceleration is a minimum; when the potential energy is a zero

In simple harmonic motion, when is the speed the greatest? (There could be more than one correct choice.)

8 Hz

The wavelengths of the sounds produced by two horns are 6.0 m and 7.0 m, respectively. What beat frequency is heard when the horns are sounded on a day when the speed of sound is 340 m/s?

658 Hz

What is the frequency does a stationary observer hear when a train approaches her with a speed of 30 m/s. The frequency of the train horn is 0.600 kHz and the speed of sound is 340 m/s

560 Hz

What is the frequency of a pressure wave of wavelength 2.5 m that is traveling at 1400 m/s?

181 Hz

What is the frequency of the fundamental mode of vibration of a steel piano wire stretched to a tension of 440 N? The wire is 0.600 m long and has a mass of 5.60 g

10-5 W/m2

What is the intensity of a 70-dB sound? The threshold of human hearing is 1.0 × 10-12 W/m2.

0.35 m

Two in-phase loudspeakers are 3.0 m apart. They emit sound with a frequency of 490 Hz. A microphone is placed half-way between the speakers and then moved along the line joining the two speakers until the first point of constructive interference is found. At what distance from that midpoint is that first point? The speed of sound in air is 343 m/s

0.34 m

Two in-phase loudspeakers are placed along a wall and are separated by a distance of 4.00 m. They emit sound with a frequency of 514 Hz. A person is standing away from the wall, in front of one of the loudspeakers. What is the closest distance from the wall the person can stand and hear destructive interference? The speed of sound in air is 343 m/s.

422 Hz

Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 5.00 m. A person is standing 12.0 m away from the wall, equidistant from the loudspeakers. When the person moves 1.00 m parallel to the wall, she experiences destructive interference for the first time. What is the frequency of the sound? The speed of sound in air is 343 m/s.

1.54 s

Two motors in a factory are running at slightly different rates. One runs at 825.0 rpm and the other at 786.0 rpm. You hear the sound intensity increase and then decrease periodically due to wave interference. How long does it take between successive instances of the sound intensity increasing?

T

Two simple pendulums, A and B, are each 3.0 m long, and the period of pendulum A is T. Pendulum A is twice as heavy as pendulum B. What is the period of pendulum B?

1.71 m

Two stereo speakers mounted 4.52 m apart on a wall emit identical sound waves. You are standing at the opposite wall of the room at a point directly between the two speakers. You walk 2.11 m parallel to the wall, to a location where you first notice that the sound intensity is essentially zero. If the wall along which you are walking is 10.7 m from the wall with the speakers, what is the wavelength of the sound waves? The walls are cushioned to absorb sound reflections

1.42 m

What is the length of the shortest pipe closed on one end and open at the other end that will have a fundamental frequency of 0.060 kHz on a day when the speed of sound is 340 m/s?

256 Hz

What is the wave speed in a brass wire with a radius of 0.500 mm stretched with a tension of 125 N? The density of brass is 8.60 × 103 kg/m3.

0.695 s

When a 0.350-kg package is attached to a vertical spring and lowered slowly, the spring stretches 12.0 cm. The package is now displaced from its equilibrium position and undergoes simple harmonic oscillations when released. What is the period of the oscillations?

439 Hz

You are moving at 120 km/h toward a stationary train. The train blows its 0.400-kHz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?