PHYSICS FINAL!!
An airplane flies 110.0 km East, then 235 km South. What is the magnitude (in km) of the airplane's net displacement?
259 km SE
The diagram above represents a light ray reflecting from a plane mirror. The angle of reflection for the light ray is
25°
You throw a rock horizontally off a cliff with a speed of 20.0 m/s and no significant air resistance. After 2.0 s, the magnitude of the velocity of the rock is closest to
28 m/s
A car travels 20.0 km west and then 20.0 km south. What is the magnitude of its displacement vector?
28.3 km
You and a friend create a standing wave with a rope, then you both hold your hands still while the standing wave continues oscillating. In total, there are 4 nodes in this wave. How many anti-nodes are there?
3
A longitudinal wave moves through water in a glass tank of length 9.0 meters, as shown above. Three wavelengths will fit in the length of the tank, and the frequency of the wave is 500 Hz. what is the wavelength of the wave?
3.0 m
As shown in the diagram above, a student standing on the roof of a 50.0 meter high building kicks a stone at a horizontal speed of 4.00 m/s. How much time is required for the stone to reach the level ground below? [Neglect Air Resistance.]
3.19 seconds
What is the approximate total time required for the ball to reach the ground? [Neglect air resistance.].
3.5 seconds
A ball rolls over the edge of a platform with only a horizontal velocity. The height of the platform is 1.6 m and the horizontal range of the ball from the base of the platform is 20.0 m. What is the horizontal velocity of the ball just before it touches the ground? Neglect air resistance.
35 m/s
Neglecting air resistance, if a ball is thrown at 4.5 m/s horizontally from a 94 m high cliff, how far has the ball fallen after 2.7 s?
36 m
Violet light has a frequency of 7.5 • 1014 Hz. The wavelength of violet light is most nearly
4.0 • 10-7 m
An airplane flies between two points on the ground that are 500 km apart. The destination is directly north of the point of origin of the flight. The plane flies with an airspeed of 120 m/s. If a constant wind blows at 10 m/s toward the west during the flight, what direction must the plane fly relative to the air to arrive at the destination?
4.8° east of north
The diagram above shows a beam of electrons fired through the region between two oppositely charged parallel plates in a cathode ray tube. After passing between the charged plates, the electrons will most likely travel path
A
How does a circuit breaker protect a refrigerator?
When the current is too high, a resettable switch opens the circuit
A ball rolls off a table with different speeds and follows the trajectories shown below. Neglecting air friction, the time between leaving the table and hitting the floor will be greatest for
the time will be the same for all three paths of the ball
The diagram above represents the magnetic lines of force around a bar magnet. At which point is the magnitude of the magnetic field strength of the bar magnet the greatest?
A
Which of the following means that an image is located in front of a mirror?
+di
An object is placed 5 cm away from an optical device. The image is magnified and has the same orientation as the object. The optical device could be a
- Concave mirror - Convex mirror (maybe)
A particle with charge of 6.0 • 10-5 C enters a 3.0 T magnetic field moving with a velocity of 760 m/s perpendicular to the field. What is the force experienced by the charge as it enters the magnetic field?
0.14 N
What is the frequency of a wave with a speed of 10 m/s and wavelength of 20 m?
0.5 Hz
An alpha particle (proton) is moving with a velocity of 820.0 m/s through a magnetic field which has a field intensity of 1.20 Tesla. Assuming that this particle is moving at right angles to the field what will be the magnitude of the resultant magnetic force on it?
1.57 • 10-16 N
A magnetic field, which has an intensity of 0.950 Tesla, is directed vertically downward (along the -y axis). A beta particle (electron) is moving horizontally through the field from left to right along the +x axis at 12,000 m/s as shown in the diagram above. What will be the magnitude of the magnetic force acting on this electron?
1.82 • 10-15 N
A boat, whose speed in still water is 8.0 m/s, crosses a river with a current of 6.0 m/s. If the boat heads perpendicular to the current, what is the speed of the boat relative to an observer standing on the shore as it crosses the river?
10. m/s
A plane flying horizontally at a speed of 50 m/s and at an elevation of 160 m drops a package, and 2.0 s later it drops a second package. How far apart will the two packages land on the ground if air resistance is negligible?
100 m
Calculate the resultant vector for the diagram above.
11.2 meters
Waves move along a stretched string at a speed of 8.0 m/s. The end of the string vibrates up and down once every 1.5 s. What is the wavelength of the waves traveling along the string?
12 m
What is the magnitude of side A?
13.4 meters
A plane has an eastward heading with an airspeed of 156 m/s. A 20.0 m/s wind is blowing southward at the same time as the plane is flying. The velocity of the plane relative to the ground is
157 m/s at an angle 7.31° south of east.
A wind farm generator uses a two-bladed propeller mounted on a pylon at a height of 20.0 m, as shown in the figure. The width of the pylon is very narrow, and the length of each propeller blade is 12.0 m. A tip of the propeller breaks off just when the propeller is vertical. The fragment flies off horizontally, falls, and strikes the ground at point P with negligible air resistance. Just before the fragment broke off, the propeller was turning uniformly, taking 1.20 s for each rotation. Approximately how far is point P from the base of the pylon?
160 m
A displacement vector is 34.0 m in length and is directed 60.0° west of north. What are the components of this vector?
17.0 m Northward, 29.4 m Westward
A 4.0 kg rock and 1 kg stone fall freely from rest from a height of 100 meters. After they fall for 2.0 seconds, the ratio of the rock's speed to the stone's speed is
1:1
The speed of light in a piece of glass is 1.5 • 108 m/s. What is the index of refraction of the glass?
2.0
How much time does it take light from a flash camera to reach a subject 6.0 meters across a room?
2.0 • 10-8 seconds
A hiker walks 3.00 km north, 4.00 km east, 5.00 km south, and 4.00 km west. The magnitude of the resultant displacement of the hiker is
2.00 km south
You and a friend are looking in a large, flat mirror against a wall. Your friend is 0.80 m away from the mirror and you are 0.50 m directly behind her. How far are you from the image of your friend in the mirror?
2.1 m
The diagram above shows a standing wave in a string clamped at each end. The un-stretched string above is 1.0 meter long when not vibrating. If the speed of the waves in the diagram shown above is 10.0 m/s, what is the frequency of the oscillations shown?
20.0 Hz
An object is placed 30. m away from a converging lens and the image appears at a distance of 70. m from the lens. What is the focal length of the lens?
21 m
A hockey puck slides off the edge of a platform with an initial velocity of 20.0 m/s horizontally. The height of the platform above the ground is 2.0 m. What is the approximate magnitude of the velocity of the puck just before it touches the ground? You can neglect air resistance.
21 m/s
Which term describes the amount of energy that is used in a circuit each second?
Power
A person throws a ball horizontally from the top of a building that is 24.0 m above the ground level. The ball lands 100.0 m down range from the base of the building. What was the initial velocity of the ball? Neglect air resistance.
45.2 m/s
What is the resultant of a 3.00 meter vector and 4.00 meter vector at right angles to each other?
5.00 meters
A 29 cm wide image is seen through a compound system with a magnification of 5.0. What is the width of the object?
5.8 cm
You are visiting the Grand Canyon and you give out a shout, then hear your echo 3.00 seconds later. If sound travels at 343 m/s through the air between you and the cliff, then how far away is the wall that your voice reflected off of?
515 m
Sally's face is 54 cm in front of a plane mirror. Where is the image of Sally's face?
54 cm behind the mirror
What is the reading of ammeter A2?
6 A
A hockey puck slides off the edge of a horizontal platform with an initial velocity of 20.0 m/s horizontally and experiences no significant air resistance. The height of the platform above the ground is 2.0 m. What is the magnitude of the vertical component of the velocity of the puck just before it hits the ground?
6.3 m/s
An object is located 20.0 cm from a convex lens. The lens forms a real image at a distance of 10.0 cm. What is the focal length of this lens?
6.67 cm
A cannonball is launched horizontally from a tower. If the cannon has a barrel velocity of 60.0 m/s, where will the cannonball be 1.00 second later? (Neglect air resistance.)
60.0 m downrange
You walk 53.0 m to the north, then you turn 60.0° to your right and walk another 45.0 m. Determine the approximate direction of your displacement vector. Express your answer as an angle relative to east.
63° N of E
You walk 33.0 m to the north, then turn 60.0° to your right and walk another 45.0 m. Approximately how far are you from where you originally started?
68 m
Two waves of the same frequency interfere with each other. The first wave has amplitude A1 = 38 cm and wavelength λ1 = 3 m. The second wave has amplitude A2 = 31 cm and wavelength λ2 = 3 m. What is the amplitude of the sum of the two waves if the waves are exactly in phase?
69 cm
A cannon with a barrel velocity of 140 m/s launches a cannonball horizontally from a tower. Neglecting air resistance, what vertical distance will the cannonball have fallen after 4.00 seconds?
78.5 m
An object possessing a deficit of 6.0 • 106 electrons has a net charge of
9.6 • 10-13 C
Which of the following best explains how a raindrop separates white light into different colors?
Red and blue light waves travel through water at different speeds.
Compare two physical systems that oscillate. One is a mass swinging back and forth at the end of a string (pendulum) and the other is a mass hanging from a spring. Which of these systems changes its natural frequency more when the object's mass changes?
A spring system changes its natural frequency, whereas a pendulum does not.
When the sun is low on the horizon at sunset, it appears redder in color, the best explanation for this is that the atmosphere
Scatters the shorter wavelength, blue and green light
The electrostatic force, FE, varies inversely with the square of the distance between the centers of two charged objects. This was first described by:
Charles-Augustin de Coulomb
What is the correct relationship between current, resistance, and voltage?
Current is inversely proportional to resistance and directly proportional to voltage.
Mary and Debra stand on a snow-covered roof. They both throw snowballs with the same initial speed, but in different directions. Mary throws her snowball downward, at 30° below the horizontal; Debra throws her snowball upward, at 30° above the horizontal. Which of the following statements are true about just before the snowballs reach the ground below?
Debra's snowball will stay in the air longer than Mary's snowball.
What happens when a rubber balloon is rubbed with a piece of fur, giving it a negative charge?
Electrons are added to the balloon
A student combs his hair with a plastic comb, and the hair becomes positively charged. What is the net charge of the comb and the direction of the charge transfer?
Electrons move from the hair to the comb, and the total charge of the comb is negative
A car's horn emits a constant frequency as it accelerates away from a stationary listener. Which of the following quantities actually changes for the listener? I. Frequency of the sound II. Pitch of the sound III. Amplitude of the sound IV. Loudness of the sound
II and IV only
Which is true of Earth's magnetic north pole?
It is located near the geographic south pole.
A rock is thrown from the upper edge of a tall cliff at some angle above the horizontal. It reaches its highest point and starts falling down. Which of the following statements about the rock's motion are true just before it hits the ground?
Its horizontal velocity component is the same as it was just as it was launched.
What property of light explains the formation of shadows?
Light travels in straight lines.
A tuning fork vibrating in air produces sound waves. These waves are best classified as
Longitudinal, because the air molecules are vibrating parallel to the direction of wave motion
A concave mirror has a focal length of 15. cm. A 5.0 cm tall candle is placed at a distance of 40.0 cm in front of the mirror. Determine the image distance.
NOT 8.0 cm
A converging lens has a focal length of 30.0 cm. A 5.00 cm tall candle is placed at a distance of 10.0 cm in front of the lens. Determine the image distance.
NOT- 15.0 cm
A magnetic field, which has an intensity of 0.950 Tesla, is directed vertically downward (along the -y axis). A beta particle (electron) is moving horizontally through the field from left to right along the +x axis at 12,000 m/s as shown in the diagram above. What will be the direction of the magnetic force acting on this electron?
NOT- towards the top of the page (along the +y axis)
When describing image formation for a plane mirrors, what is an important rule to remember about light rays?
The angle when it leaves the mirror is the same as the angle when it hits.
Two charges separated by a distance r experience an attractive force of 5 N. The distance between the charges then increases by a factor of 2. What must happen to one of the charges to keep the force between them the same?
The charge must increase by a factor of 4.
Which of the following is not a result of magnetic forces?
The moon orbiting the Earth.
An object is launched across a room. How can a student determine the average horizontal velocity of the object using a meter stick and a calculator?
The student can measure the horizontal travel distance, compute the flight time from the vertical drop, and then calculate the average horizontal velocity.
Which of the following is the best description of the optical axis of a spherical mirror?
a line passing through both the focal point and the center of curvature
A harmonic is:
an oscillator whose frequency is a multiple of another wave
If you are wearing a red shirt, but then you go into a dark room that is only lit by a faint green light, then what color will your shirt seem to be?
black
Plastic insulation surrounds a wire having diameter d and length l as shown above. A decrease in the resistance R of the wire would be produced by an increase in the
diameter of the wire
The diagram above shows wave fronts spreading into the region behind a barrier. Which wave phenomenon is represented in the diagram?
diffraction
In the diagram above, proton p, neutron n, and electron e are located as shown between two oppositely charged plates. The magnitude of acceleration will be greatest for the
electron because it has the smallest mass
Which of the following characteristics is associated with high energy for a mechanical wave?
high amplitude
Red light is passed through two narrow slits and forms a pattern of bright and dark lines on a screen. The phenomenon primarily responsible for this pattern is
interference
A spaceship is moving away from Earth when a radio signal is received. Compared to the frequency of the signal sent from Earth, the frequency of the signal received by the spaceship is?
lower
Which of the following is NOT a compound optical system?
magnifying glass
The diagram above shows sunglasses being used to eliminate glare. Which wave phenomenon of light is represented in the diagram?
polarization
A candle is placed on the principal axis of a convex lens at a distance of 30 cm from the lens. The focal length of the lens is 10 cm. The image formed will be
real and inverted
Which phenomenon of light does this example illustrate?
refraction
A girl on a swing may increase the amplitude of the swing's oscillations if she moves her legs at the natural frequency of the swing. This is an example of:
resonance
Scientists can tell that the universe is expanding because light from other galaxies is shifted towards the red end of the visible spectrum (called the red-shift). This shift in the frequency of light due to the relative motion of one galaxy to another is caused by which of the following:
the Doppler Effect
A sound wave has a frequency of 400 Hz in 20° air. Which of these is closest to the wavelength of this sound?
the height of a desk
In the picture above, the person sees the image of the fish in a different location than the actual fish. This happens because:
the light rays reflected from the fish bend at the surface of the water
The speed of any mechanical wave depends on...
the medium through which it travels
The diagram above represents the path of a stunt car that is driven off a cliff, neglecting air resistance. Compared to the horizontal component of the car's velocity at Point A, the horizontal component of the car's velocity at point B is
the same
An electron placed between oppositely charged parallel plates A and B moves toward plate A, as represented in the diagram above. What is the direction of the electric field between the plates?
towards plate B
Which form of electromagnetic waves is most associated with causing sunburns?
ultraviolet light
How would you represent the horizontal component, vx, of the velocity vector shown in the diagram above?
vx = 10m/s • cos(45°)
The x and y components of a displacement vector are 1.23 m and 8.90 m respectively. What angle does the vector make with the x axis?
θ = 82.1°
