Sr Physics Spring Final

What length must a pendulum have to have a period of 3.3 seconds?

2.7 m

Voltage _______ an electrical circuit a. goes through b. is expressed across c. is constant throughout d. is the rate at which charges move through

b. is experssed across

A node is a point along a medium where there is always

destructive interference

As a wave travels into a medium in which its speed increases, its wavelength would

increase

Consider the motion of waves in a wire. Waves will travel fastest in a _ wire.

tight and light

permanent displacement

translational

wave type in which particles of the medium move perpendicular to wave direction

transverse

the distance between successive nodes in any standing wave pattern is equivalent to _ wavelengths.

1/2

Ch 10 - Vibrations & Waves

I will go feral

Object A is charged by contact using a negatively charged object.

Negative

Object A is charged by induction using a positively charged object.

Negative

Object A has a x-y coordinate position of (+5.0,0.0). Object B has a location of (0.0,+4.0). If Object A has a charge of -5.8 uC and Object B has a charge of +8.9 uC, then what would be the magnitude of the net electric force upon a +1.3 uC charge if placed at the origin?

Net force= .0071 N

Ch 8 - Static Electricity

Not the vibe

type of wave that describes photons

electromagnetic

cannot transmit its energy through a vacuum

mechanical

wave type in which medium particles undergo circular motion

surface

Alfredo deDarke sleeps with a 7.5-Watt night light bulb on. He turns it on before getting in bed and turns it off 8 hours later. Determine the annual savings if Alfredo replaced his 7.5-Watt incandescent might light by a 0.5-Watt LED night light.

$2.80 --SigFigs--> $3

Alfredo deDarke sleeps with a 7.5-Watt night light bulb on. He turns it on before getting in bed and turns it off 8 hours later. Electrical energy costs 13 cents/kW*hr where Alfredo lives. Determine the annual (365 days) cost of this practice of using a 7.5-Watt night light.

$2.85 --SigFigs--> $3

If a neutral object loses 1.5 x 10^6 electrons, then what will be its charge?

-1.6x10^-19 times -1.5x10^6= +2.4x10^-13 C

At a location of 0.200 m from Object A, the electric field strength is 0.0500 N/C. If the electric field strength were measured at a location of 1.00 m from Object A, then the field strength would be

.00200 N/C

At a location of 0.200 m from Object A, the electric field strength is 0.0500 N/C. If the electric field strength were measured at a location of 0.400 m from Object A, then the field strength would be

.0125 N/C

At a location of 0.200 m from Object A, the electric field strength is 0.0500 N/C. If the electric field strength were measured using a test charge with twice the charge at a location of 0.200 m from Object A, then the field strength would be

.0500 N/C

Alfredo deDarke sleeps with a 7.5-Watt night light bulb on. He turns it on before getting in bed and turns it off 8 hours later. Determine the amount of energy used during one evening in units of kiloWatt*hours.

.06 kWh

At a separation distance of 0.500-m, two like-charged balloons experience a repulsive force of 0.320 N. If the distance is doubled, then the repulsive force would be

.0800 N

At a separation distance of 0.500-m, two like-charged balloons experience a repulsive force of 0.320 N. If the distance is increased by a factor of 3 and the charge of both balloons is doubled, then the repulsive force would be

.142 N

At a location of 0.200 m from Object A, the electric field strength is 0.0500 N/C. If the electric field strength were measured using a test charge with twice the charge at a location of 0.100 m from Object A, then the field strength would be

.200 N/C

A 1.19-gram charged balloon hangs from a 1.99-m string which is attached to the ceiling. A Van de Graaff generator is located directly below the location where the string attaches to the ceiling and is at the same height as the balloon. The string is deflected at an angle of 32 degrees from the vertical due to the presence of the electric field. Determine the charge on the Van de Graaff generator is the charge on the balloon is 2.27x10^-12 C.

.397 C

Microbats use echolocation to navigate and hunt. They emit pulse of high frequency sound waves which reflect off obstacles and objects in their surroundings. By detecting the time delay between the emitted pulse and the return of the reflected pulse, a bat can determine the location of the object. Determine the time delay between the delay between the sending of a pulse and the return of its reflection from an object located 12.5 m away. Aproximate the speed of the sound waves as 345 m/s.

0.0725 sec

At a separation distance of 0.500-m, two like-charged balloons experience a repulsive force of 0.320 N. If the distance is halved, then the repulsive force would be

1.28 N

A resistor with a resistance of R is connected to a battery with a voltage of V to produce a current of I. What would be the new current (in terms of I) if the resistance is doubled and the same voltage is used?

1/2 I

A resistor with a resistance of R is connected to a battery with a voltage of V to produce a current of I. What would be the new current (in terms of I) if the voltage is halved and the resistance is doubled

1/4 I

A resistor with a resistance of R is connected to a battery with a voltage of V to produce a current of I. What would be the new current (in terms of I) if five times the voltage and one-third the resistance is used

15 I

If 4 Coulombs of charge flow past point A in 1 second, then _ Coulombs of charge flow past point C in 4 seconds.

16

A resistor with a resistance of R is connected to a battery with a voltage of V to produce a current of I. What would be the new current (in terms of I) if the voltage is doubled and the same resistance is used

2 I

Use proper schematic symbols to construct a diagram of a circuit powered by a 6-Volt battery that consists of two 3-ohm resistors connected in parallel. Place an ammeter in series with each of the individual resistors in a manner that the current through each resistor can be measured. On the schematic diagram, use an unbroken arrow to indicate the direction of convectional current. Finally, indicate the ammeter readings on the diagram.

2 amp, 2 amp, 4 amp _________________________ _ | | - 3o < 3o < _ 6V > > - | | | () 2A () 2A |___________|___________|

a stretched string vibrates with a fundamental frequency of 100 Hz. The frequency of the second harmonic is

200. Hz

A resistor with a resistance of R is connected to a battery with a voltage of V to produce a current of I. What would be the new current (in terms of I) if the voltage is tripled and the resistance is doubled

3/2 I

A resistor with a resistance of R is connected to a battery with a voltage of V to produce a current of I. What would be the new current (in terms of I) if the voltage is doubled and the resistance is halved

4 I

A resistor with a resistance of R is connected to a battery with a voltage of V to produce a current of I. What would be the new current (in terms of I) if one-fifth the voltage and one-fourth the resistance is used

4/5 I

Standing waves are produced in a wire by vibrating one end at a frequency of 100. Hz. The distance between the 2nd and the 5th nodes is 60.0 cm. The wavelength of the original traveling wave is _ cm.

40.0

At a separation distance of 0.500-m, two like-charged balloons experience a repulsive force of 0.320 N. If the distance is decreased by a factor of 3 and the charge of both balloons is doubled, then the repulsive force would be

5.76 N

A 2.0-meter long rope is hanging vertically from the ceiling and attached to an oscillator. A single pulse is observed to travel to the end of the rope in 0.50 s. What frequency should be used by the vibrator to maintain three whole waves in the rope?

6 Hz

A standing wave experiment is performed to determine the speed of waves in a rope. The standing wave pattern shown below is established in the rope. The rope makes exactly 90 complete vibration cycles in one minute. The speed of the waves is _.

6 m/s

A wave whose speed in a snakey is 4.4 m/s enters a second snakey. The wavelength changes from 2.0 m to 3.0 m. The wave in the second snakey travels at approximately ...

6.6 m/s

If 4 Coulombs of charge flow past point A in 2 seconds, then _ Coulombs of charge flow past point B in 4 seconds.

8

Ch 9 - Electric Cicuits

Also rank

___A A____ V The diagram shows a disturbance moving through a rope towards the right. If this disturbance meets a similar disturbance moving to the left, then which one of the diagrams below depict a pattern which could NEVER appear in the rope? ___A A____ A __a___a___ B V C _a A a___ D __ A __ E ___a aa a__ v v V V v v

D

Like all planets, the planet veins orbits the sun in periodic motion and simultaneously spins about its axis. Just as on earth, the time to make one complete orbit (period of orbit) is what defines a year. And the time to make one complete revolution about its axis (period of rotation) is what defines a day. The period of orbit for earth is 36.25 days and the period of rotation is 24 hours (1 day). But when these same values for Venus are expressed relative to earth, it is found that Venus has a period of orbit of 225 days and a period of rotation of 243 days. So, for Venus inhabitants, a day would last longer than a year! Determine the frequency of orbit and frequency of rotation on Venus.

Frequency of orbit= 5.14 *10^-8 Hz Frequency of rotation= 4.76 *10^-8 Hz

Consider the diagram below of a parallel circuit. For each resister, use arrows to indicate the two locations where one would have to tap with the leads of a voltmeter in order to measure the voltage drop across the individual resistor. Finally, indicate the ammeter readings and voltage readings. 120 V R1 = 5 R2 = 10 R3 = 15

I = 24 A I = 12 A I = 8 A I = 44 A V1 = 120 V V2 = 120 V V3 = 120 V

Consider the diagram below of a series circuit. For each resistor, use arrows to indicate the two locations where one would have to tap with the leads of a voltmeter in order to measure the voltage drop across the individual resistor. Finally, indicate the ammeter readings and the voltage readings. 120 V R1= 5 ohms R2= 10 ohms R3 = 15 Ohms

I1= 4 A I2 = 4 A I3 = 4 A V1 = 20 V V2 = 40 V V3 = 60 V

A neutral plastic strip is rubbed with cotton and acquires a positive charge. Which of the following statements are true of the positively-charged strip?

It lost electrons to the cotton during the charging process. It has the opposite charge of the cotton. It has an excess of protons compared to the number of electrons. It could be used to charge an electroscope negatively by the process of induction.

A rubber rod has a greater electron affinity than animal fur. The rubber rod is charged by friction with animal fur. The rubber rod is then used to charge Object A by the method of contact.

Negative

Object A is used to charge an aluminum plate by the method of induction. The aluminum plate acquires a positive charge.

Negative

Positively charged balloon is left of Can N but a finger is contacting the can from the right. What charge is Can N?

Negative

Positively charged balloon is left of Cans I and J and a negatively charged balloon is right of the cans. Cans I and J have what charge?

Negative, Positive

Positively charged balloon is left of Can P. What charge does it have?

Neutral

A negatively-charged object creates an electric field which can be measured at various locations in the region about it. An electric field vector is drawn for point X. Use your understanding of the electric field- distance relationship to draw E VECTORS for points A-E. (Length of arrow-strength of E Vector)

Now, assume that each of the points are positive test charges instead. Draw electric field lines that reflect this new consideration.

A rubber rod has a greater electron affinity than animal fur. The rubber rod is charged by friction with animal fur. The rubber rod is then used to charge Object A by the method of induction.

Positive

A rubber rod has a greater electron affinity than animal fur. The rubber rod is charged by friction with animal fur. The rubber rod is then used to charge an aluminum pop can by the process of induction. The pop can is then contacted to Object A.

Positive

Object A is charged by friction using animal fur. Animal fur has a greater electron affinity than object A.

Positive

Object A is used to charge an aluminum plate by the method of induction. The aluminum plate acquires a negative charge.

Positive

Negatively charged balloon is held to the left of two cans G,H. Cans G and H have what charge?

Positive, Negative

Two negatively charged balloons are on the sides of 3 cans KLM. What charge do the cans have?

Positive, Negative, Positive

Anna literal and Stan Dingwaives are holding an elastic corn between them that measures 1.6 meters long. They create a wave which travels at 2.4 m/s and have a frequency of 1.5 Hz. What would be the new be the new wavelength and speed if they double the frequency of vibration of the cord?

Wavelength= 0.80 meters Speed= 2.4 m/s

A transverse wave is observed to be moving along a lengthy rope. Adjacent crests are positioned 2.4 m apart. Exactly six crests are observed to move past a given point along the medium 9.1 seconds. Determine the wavelength, frequency and speed of these waves.

Wavelength= 2.4 meters speed= 1.6 m/s frequency= 0.66 Hz

In the diagram below, a person positioned at point A would perceive _ frequency as the person positioned at point B. A (((o ) ) ) ) ) B

a higher

A high voltage battery can ____. a. do a lot of work on each charge it encounters b. do a lot of work over the course of its lifetime c. push a lot of charge through a circuit d. last a long time

a. do a lot of work on each charge it encounters

Charge flowing through this circuit is most energized at ____. a. the + terminal of the battery b. the - terminal of the battery c. just prior to entering the light bulb d. just after exiting the light bulb

a. the + terminal of the battery

Which of the following statements represent correct unit equivalencies? List all that apply. a. 1 Ampere = 1 Coulomb / second b. 1 Joule = 1 Volt / Coulomb c. 1 Watt = 1 Joule • second d. 1 Watt = 1 Volt • Coulomb / second e. 1 Joule / Ohm = 1 Ampere • Coulomb f. 1 Joule • Ohm = 1 Volt2 • second

adef

Parallel circuit (2 resistors) with an overall voltage of 12. The electric potential difference (voltage drop) across each resistor is ______ V. a. 6 b. 12 c. 24 d. nonsense! The electric potential difference is dependent upon the actual resistance of the resistors

b. 12

Two difference ropes with different mass densities are attached to each other. A pulse is introduced into one end of the rope and approaches the boundary as shown at the right. At the boundary, a portion of the energy is transmitted into the new medium and a portion is reflected. Which one of the diagrams below depicts the possible location and orientation of the pulse shortly after the incident pulse reaches the boundary?

c

Te potential energy possessed per unit of charge at any given location is referred to as the electric _________. a. current b. resistance c. potential d. power

c. potential

Parallel circuit (2 resistors) with an overall voltage of 12. If a third resistor, identical to the other two, is added in parallel with the first two, then the electrical potential difference across each of the three individual resistors will ________. a. increase b. decrease c. reamain the same

c. remain the same

The current through the battery is a. greater than that through the light bulb b. less than that throught the light bulb c. the same as that through the light bulb d. greater than that through each wire e. less than that through each wire

c. the same as that through the light bulb

Three identical light bulbs (labeled X, Y and Z) are connected to a battery as shown at the right. Which adjustments could be made to the circuit below that would increase the current at point P? List all that apply. a. increase the resistance of one of the bulbs b. increase the resistance of two of the bulbs c. decrease the resistance of two of the bulbs d. increase the voltage of the battery e. decrease the voltage of the battery f. remove one of the bulbs

cd

Three identical light bulbs are connected to a battery as shown at the right. Which adjustments could be made to the circuit that would increase the current being measured at X? Include all that apply. a. increase the resistance of one of the bulbs b. increase the resistance of two of the bulbs c. decrease the resistance of two of the bulbs d. increase the voltage of the battery e. decrease the voltage of the battery f. remove one of the bulbs

cdf

Three identical light bulbs (labeled X, Y and Z) are connected to a battery as shown at the right. Which adjustments could be made to the circuit below that would decrease the current in bulb Z? List all that apply. a. increase the resistance of bulb X b. decrease the resistance of bulb X c. increase the resistance of bulb Z d. decrease the resistance of bulb Z e. increase the voltage of the battery f. decrease the voltage of the battery g. remove bulb Y

cf

A 12-Volt battery would supply ______. a. 3 C of charge with 4 J of energy b. 4 C of charge with 3 J of energy c. 12 C of charge with 1 J of energy d. 1 C of charge with 12 J of energy e. 0.5 C of charge with 24 J of energy f. 24 C of charge with 2 J w of energy

d. 1 C of charge with 12 J of energy

Parallel circuit (2 resistors) with an overall voltage of 12. If a third resistor, identical to the other two, is added in parallel with the first two, then the overall resistance will ________ and the overall current will ______. a. increase, increase b. decrease, decrease c. increase, decrease d. decrease, increase e. increase, remain the same f. decrease, remain the same g. remain the same, increase h. remain the same, decrease

d. decrease, increase

The drift velocity of mobile charge carriers in electric circuits is _______. a. very fast; less than but very close to the speed of light b. fast; faster than the fastest car but nowhere near the speed of light c. slow; slower than Michael Jackson runs the 220-meters d. very slow; slower than a snail

d. very slow; slower than a snail

A certain electrical circuit contains a battery, wires, and a light bulb. If the potential energy is gained by charges at the battery location, then charges lose potential energy _________. a. in the wires only b. in the bulb only c. equally in the wires and the bulb d. mostly in the wires but a little in the bulb e. mostly in the bulb but a little in the wires f. nowhere

e. Mostly in the bulb but a little in the wires

A 2.0 kg mass is attached to a spring. If the spring is elongated to 4.0 cm, determine the elastic potential energy.

force = -Kx => 2(-9.8) = -K(0.04) K = 490 N/m PE elastic = .5kx^2 = k(.0008) 0.39 Joules

As a wave passes across a boundary into a new medium, which characteristic of the wave would NOT change?

frequency

One ampere is the amount of current that exists when _______ flows by a certain point in a conductor in _______. a. one watt; one second b. one joule; one hour c. one electron; one second d. one electron; one hour e. one volt; one second f. one volt; one hour g. one coulomb; one second h. one coulomb; one hour

g. one coulomb; one second

If 6 coulombs of charge flow past point A in a circuit in 4 seconds, then _______ coulombs of charge will flow past point A in 8 seconds. a. 0.67 b. 1.5 c. 2 d. 3 e. 4 f. 6 g. 8 h. 12

h. 12

As two or more waves pass simultaneously through the same region, _ can occur.

interference

What type of wave is produced when the particles of the medium are vibrating to and fro in the same direction of wave propagation?

longitudinal

describes parallel motion between medium particles and wave direction

longitudinal

A transverse wave is traveling through a medium. See diagram below. The particles of the medium are vibrating _. A B /\ /\ / \ / \ D \/

parallel to the line joining AD

pendulums and springs are subjected to this type of motion

periodic

The main factor which effects the speed of a sound wave is the _.

properties of the medium

In the standing wave lab, lab partners Chloe and Paige adjust the frequency of a mechanical oscillator in order to vibrate a 1.38 m length of elastic cord at one of its harmonic frequencies. The cord vibrates with the pattern shown below when the frequency is set to 79.4 Hz. Determine the speed of the waves in the elastic cord.

speed: 43.8 m/s

type of motion that wiggles about an equilibrium position

vibrational