Phys 101 exam 2

Calculate the gravitational potential energy with respect to the floor of a 5 N jar of pickles that rests on a shelf 2.0 m above the floor. a) 10 J b) 100 J c) 1000 J d) 50 J e) 5 J

10 J

As the pitch of a sound increases, its speed a. increases. b. decreases. c. stays the same.

stays the same

A piano tuner knows that a key on the piano is tuned to the frequency of his tuning fork when he strikes them at the same time and the number of beats he hears each second is a. 0. b. 1. c. 2. d. the note's frequency divided by 2. e. 3.

0

A kid on a playground swing makes a complete to-and-fro swing each 2 seconds. The frequency of swing is a) 0.5 Hz. b) 1 Hz. c) 2 Hz.

0.5 Hz

A 340-hertz sound wave travels at 340 m/s in air with a wavelength of a. 1 m. b. 10 m. c. 100 m. d. 340 m. e. None of these choices are correct.

1 m

A fly flaps its wings back and forth 150 times each second. The period of a wing flap is a) 150 sec. b) 1.5 sec. c) 1/75 sec. d) 1/150 sec.

1/150 sec.

What fraction of a sound wavelength is depicted in the sketch above? (1st harmonic) a. 1/4 b. 2/4 c. 3/4 d. 4/4 e. need more information

1/4

What is the power rating when lifting a 1.0 kg mass a height of 2.0 m, if it took 2.0 s? a) 2 J b) 2 W c) 1 W d) 20 J e) 10 W f) 40 J

10 w

Calculate the gravitational potential energy with respect to the floor of a 5 kg jar of pickles that rests on a shelf 2.0 m above the floor. a) 10 J b) 100 J c) 1000 J d) 50 J e) 5 J

100 J

How much work is done when a horizontal force of 25 N is applied through a distance of 4.0 m, if it took 5.0 s? a) 20 J b) 20 W c) 100 W d) 100 J e) 500 J

100 J

How much work is done when a horizontal force of 25 N is applied through a distance of 4.0 m, if it took 5.0 s? a) 20 J b) 20 W c) 100 W d) 100 J e)500 J

100 J

Determine the kinetic energy of a 20.0 kg bicycle that is moving with a speed of 10.0 m/s. a) 4000 J b) 400 J c) 200 J d) 1000 J e) 2000 J

1000 J

Which takes more power - lifting a 10 lb sack of fertilizer 2 feet in 3 s, or lifting it 2 feet in 2 s? a) 2 feet in 3 s b) 2 feet in 2 s c) both take the same amount of power

2 feet in 2s

The amplitude of a particular wave is 1 meter. The top-to-bottom distance of the disturbance is a) 0.5 m. b) 1 m. c) 2 m. d) none of these

2 m

As a train of water waves goes by, a piece of cork floating on the water bobs up and down one complete cycle each second. The waves are 2 meters long. What is the speed of the wave? a) 0.25 m/s b) 0.50 m/s c) 1.0 m/s d) 2 m/s e) 4 m/s

2 m/s

A kid on a playground swing makes a complete to-and-fro swing each 2 seconds. The period of swing is a) 0.5 second. b) 1 second. c) 2 second.

2 second

Calculate the gravitational potential energy with respect to the floor of a 10 N jar of pickles that rests on a shelf 2.0 m above the floor. a) 5 J b) 10 J c) 20 J d) 2 J e) 200 J

20 J

How much work is done in lifting a 1.0 kg mass a height of 2.0 m, if it took 2.0 s? a) 2 J b) 2 W c) 1 W d) 20 J e) 10 W f) 40 J

20 J

The approximate range of human hearing is a. 10 hertz to 10,000 hertz. b. 20 hertz to 20,000 hertz. c. 40 hertz to 40,000 hertz. d. 10 hertz to 40,000 hertz.

20 hertz to 20,000 hertz

A floating leaf oscillates up and down two complete cycles in one second as a water wave passes by. The wave's wavelength is 10 meters. What is the wave's speed? a) 2 m/s b) 10 m/s c) 20 m/s d) 40 m/s e) more than 40 m/s

20 m/s

What is the power rating when a horizontal force of 25 N is applied through a distance of 4.0 m, if it took 5.0 s? a) 20 J b) 20 W c) 100 W d) 100 J e) 500 J

20 w

Calculate the gravitational potential energy with respect to the floor of a 10 kg jar of pickles that rests on a shelf 2.0 m above the floor. a) 5 J b) 10 J c) 20 J d) 2 J e) 200 J

200 J

Determine the kinetic energy of a 10.0 kg bicycle that is moving with a speed of 20.0 m/s. a) 4000 J b) 400 J c) 200 J d) 1000 J e) 2000 J

2000 J

The wave diagram above depicts 12 seconds of a wave's motion. Determine the amplitude of the wave. a) 3 in b) 6 in c) 12 in d) 24 in e) 48 in

24 in

Which takes more work - lifting a 10 lb sack of fertilizer 3 feet in 3 s, or lifting it 2 feet in 2 s? a) 2 feet in 2 s b) 3 feet in 3 s c) both take the same amount of work

3 feet in 3 s

A wave oscillates up and down two complete cycles each second. If the wave travels an average distance of 6 meters in one second, its wavelength is a) 0.5 m. b) 1 m. c) 2 m. d) 3 m. e) 6 m.

3 m

A skipper on a boat notices wave crests passing the anchor chain every 5 seconds. The skipper estimates the distance between crests is 15 m. What is the speed of the water waves? a) 3 m/s b) 5 m/s c) 15 m/s d) not enough information given

3 m/s

A 10 kg object falls 3 meters. How much kinetic energy has it gained? a) cannot answer without knowing how fast it is going b) 10 J c) 30 J d) 100 J e) 300 J

300 J

About how many octaves are present between 100 hertz and 1600 hertz? a. 4 b. 5 c. 6 d. 7 e. 8

4

A transverse wave is found to have a vertical distance of 8 cm from a trough to a crest, a frequency of 12 Hz, and a horizontal distance of 6 cm from a crest to the nearest trough. Determine the amplitude of this wave. a) 2 cm b) 4 cm c) 6 cm d) 8 cm e) 10 cm f) 12 cm

4 cm

A student with a mass of 50.0 kg runs up two flights of stairs in 8.0 sec. The student has gone a vertical distance of 8.0 m. Determine the amount of work done by the student to elevate her body to this height. Assume that her speed is constant. a) 3200 J b) 4000 J c) 400 J d) 500 J e) 50 J

4000 J

A student with a mass of 60.0 kg runs up two flights of stairs in 10.0 sec. The student has gone a vertical distance of 8.0 m. Determine the amount of power exerted by the student to elevate her body to this height. Assume that her speed is constant. a) 4800 W b) 480 w c) 600 W d) 6000 W e) 1200 W

480 w

A student with a mass of 60.0 kg runs up two flights of stairs in 10.0 sec. The student has gone a vertical distance of 8.0 m. Determine the amount of work done by the student to elevate her body to this height. Assume that her speed is constant. a) 4800 J b) 480 J c) 600 J d) 6000 J e) 1200 J

4800 J

A student with a mass of 50.0 kg runs up two flights of stairs in 8.0 sec. The student has gone a vertical distance of 8.0 m. Determine the amount of power exerted by the student to elevate her body to this height. Assume that her speed is constant. a) 3200 W b) 4000 W c) 400 W d) 500 W e) 50 W

500 W

A wave travels an average distance of 6 meters in one second. What is the wave's velocity? a) less than 0.2 m/s b) 1 m/s c) 3 m/s d) 6 m/s e) more than 6 m/s

6 m/s

A wave travels an average distance of 6 meters in one second. What is the wave's velocity? less than 0.2 m/s a) 1 m/s b) 3 m/s c) 6 m/s d) more than 6 m/s

6 m/s

A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is a) 30 hertz and it travels at 60 m/s. b) 60 hertz and it travels at 30 m/s. c) 1800 hertz and it travels at 2 m/s. d) 30 hertz and it travels at 30 m/s. e) 60 hertz and it travels at 60 m/s. f) 1800 hertz and it travels at 1 m/s.

60 hertz and it travels at 60 m/s

A student with a mass of 80.0 kg runs up two flights of stairs in 10.0 sec. The student has gone a vertical distance of 8.0 m. Determine the amount of power exerted by the student to elevate his body to this height. Assume that his speed is constant. a) 16 W b) 640 W c) 800 W d) 6400 W e) 1600 W

640 w

A student with a mass of 80.0 kg runs up two flights of stairs in 10.0 sec. The student has gone a vertical distance of 8.0 m. Determine the amount of work done by the student to elevate his body to this height. Assume that his speed is constant. a) 160 J b) 640 J c) 800 J d) 6400 J e) 1600 J

6400 J

The metric unit for work is the ___________. a) Joule b) Newton c) kilogram d) m/s/s e) Watt

Joule

A skier follows the path shown in the picture above. What is the kinetic energy and potential energy at position B? a) KE = 0 J; PE = 0 J b) KE = 30,000 J; PE = 20,000 J c) KE = 20,000 J; PE = 30,000 J d) KE = 50,000 J; PE = 0 J e) KE = 0 J; PE = 50,000 J f) KE = 15,000 J; PE = 35,000 J g) KE = 35,000 J; PE = 15,000 J

KE = 20,000 J; PE = 30,000 J

A skier follows the path shown in the picture above. What is the kinetic energy and potential energy at position A? a) KE = 0 J; PE = 0 J b) KE = 30,000 J; PE = 20,000 J c) KE = 20,000 J; PE = 30,000 J d) KE = 50,000 J; PE = 0 J e) KE = 0 J; PE = 50,000 J f) KE = 15,000 J; PE = 35,000 J g) KE = 35,000 J; PE = 15,000 J

KE=50,000 J; PE=0 J

Two wave crests are generated at opposite ends of a long rope. Will there be an instant in which the rope's amplitude is zero everywhere? a) Yes, if the waves have the same amplitude. b) Yes, if the waves have different amplitudes. c) No.

No

The metric unit for power is the __________. a) Watt b) Joule c) Newton d) m/s/s e) kilogram

Watt

The tube depicted in the sound wave sketch above is (3rd Harmonic) a. a closed tube. b. an open tube. c. cannot be determined

a closed tube

Wave interference occurs for a) sound waves. b) light waves. c) water waves. d) All of the above choices are correct. e) None of the above choices are correct.

all of the above choices are correct

The loudness of a musical sound is a measure of the sound wave's a. wavelength. b. frequency. c. speed. d. amplitude. e. all of these

amplitude

Suppose that there was a ride at an amusement park which was titled "The Standing Wave." Which location - node or antinode - on the ride would give the greatest thrill? a) node b) antinode

antinode

The least energy required to produce forced vibration in an object occurs a. below its natural frequency. b. at its natural frequency. c. above its natural frequency.

as its natural frequency

Which takes more work - lifting a 10 lb sack of fertilizer 2 feet in 3 s, or lifting it 2 feet in 2 s? a) 2 feet in 3 s b) 2 feet in 2 s c) both take the same amount of work

both take the same amount of work

Which takes more work-lifting a 10 lb sack of fertilizer 2 feet in 3s, or lifting it 2 feet in 2s?

both take the same amount of work

As the pitch of a sound increases, its wavelength a. increases. b. decreases. c. stays the same.

decreases

An object is tossed upward. As it rises, its kinetic energy ____________ and its gravitational potential energy ____________. a) increases; increases b) decreases; decreases c) increases; decreases d) decreases; increases

decreases; increases

Doubling the frequency of a wave source doubles the speed of the waves. a) True b) False

false

The pitch of a musical sound depends on the sound wave's a. wavelength. b. frequency. c. speed. d. amplitude. e. all of these

frequency

Sound generally travels slowest through which materials? a. solids b. liquids c. gases d. the same in all materials

gases

Pulling a stretched out slinky tighter will cause a pulse sent down the slinky to have a) greater amplitude. b) less amplitude. c) greater speed. d) less speed. e) both a and c

greater speed

Shorter air columns produce a. higher frequencies because the wavelength increases. b. higher frequencies because the wavelength decreases. c. lower frequencies because the wavelength increases. d. lower frequencies because the wavelength decreases. e. higher frequencies because the speed of sound increases. f. higher frequencies because the speed of sound decreases. g. lower frequencies because the speed of sound increases. h. lower frequencies because the speed of sound decreases. i. produce the same frequencies as shorter air columns.

higher frequencies because the wavelength decreases

All other things being the same, strings that are stretched more tightly will produce a. higher frequency notes. b. lower frequency notes. c. the same frequency notes.

higher frequency notes

An object is tossed upward. As it falls back down, its kinetic energy ____________ and its gravitational potential energy ____________. a) increases; increases b) decreases; decreases c) increases; decreases d) decreases; increases

increases; decrease

When the mass of a moving object is doubled, its kinetic energy... a) is doubled. b) is cut in half. c) is quadrupled. d) is divided by four. e) does not change.

is doubled

When the speed of a moving object is doubled, its kinetic energy... a) is doubled. b) is cut in half. c) is quadrupled. d) is divided by four. e) does not change.

is quadrupled

Resonance can be looked at as forced vibration with the a. least amount of energy input. b. maximum amount of energy input. c. matching of wave amplitudes. d. matching of constructive and destructive interference. e. minimum beat frequency.

least amount of energy input

If two waves are going by at the same frequency, the wave that has the greatest speed will have the greatest a) amplitude. b) length. c) frequency. d) None of these choices are true.

length

A wave is transporting energy from left to right. The particles of the medium are moving back and forth in a leftward and rightward direction. This type of wave is known as a a) mechanical b) transverse c) electromagnetic d) longitudinal

longitudinal

A sound wave is a a. longitudinal wave. b.transverse wave. c. standing wave. d. shock wave. e. None of these choices are correct.

longitudinal wave

Longer air columns produce a. higher frequencies because the wavelength increases. b. higher frequencies because the wavelength decreases. c. lower frequencies because the wavelength increases. d. lower frequencies because the wavelength decreases. e. higher frequencies because the speed of sound increases. f. higher frequencies because the speed of sound decreases. g. lower frequencies because the speed of sound increases. h. lower frequencies because the speed of sound decreases. i. produce the same frequencies as shorter air columns.

lower frequencies because the wavelength decreases

When plucked, longer strings produce a. higher frequencies because the wavelength of the wave in the string increases. b. higher frequencies because the wavelength of the wave in the string decreases. c. lower frequencies because the wavelength of the wave in the string increases. d. lower frequencies because the wavelength of the wave in the string decreases. e. higher frequencies because the speed of the wave in the string increases. f. higher frequencies because the speed of the wave in the string decreases. g. lower frequencies because the speed of the wave in the string increases. h. lower frequencies because the speed of the wave in the string decreases. i. produce the same frequencies as shorter air columns.

lower frequencies because the wavelength of the wave in the string increases

All other things being the same, strings that are stretched less tightly will produce a. higher frequency notes. b. lower frequency notes. c. the same frequency notes.

lower frequency notes

A node is a position of a) minimum amplitude. b) maximum amplitude. c) half amplitude.

minimum amplitude

We are best at hearing a. infrasonic sound. b. ultrasonic sound. c. both infrasonic and ultrasonic d. None of these choices are true.

none of these choices are true

A sound wave is different than a light wave in that a sound wave is a. produced by an oscillating object and a light wave is not. b. not capable of traveling through a vacuum. c. not capable of diffracting and a light wave is. d. capable of existing with a variety of frequencies and a light wave has a single frequency.

not capable of traveling through a vacuum

A wave travels an average distance of 1 meter in 1 second with a frequency of 1 hertz. Its amplitude is a) less than 1 meter. b) 1 meter. c) more than 1 meter. d) not enough information to say

not enough information to say

To say that one wave is out of phase with another is to say that the waves are a) of different amplitudes. b) of different frequencies. c) of different wavelengths. d) out of step. e) all of these

out of step

Which of the following can Lupert do to make his sound waves travel faster through the air while he speaks? a. speak with a higher pitch b. speak louder c. throw his forward when speaking d. raise the temperature in the room e. all of the above f. c and d only g. b and c only

raise the temperature in the room

The natural frequency of an object depends on its a. size, shape and elasticity. b. size and shape. c. size and elasticity. d. shape and elasticity.

size, shape, elasticity

Dawn and Aram have stretched a slinky between them and begin experimenting with waves. As the frequency of the waves is doubled, a) the wavelength is halved and the speed remains constant b) the wavelength remains constant and the speed is doubled c) both the wavelength and the speed are halved. d) both the wavelength and the speed remain constant.

the wavelength is halved and the speed remains constant

In designing a music hall, an acoustical engineer deals mainly with a. modulation. b. forced vibrations. c. resonance. d. beats. e. wave interference.

wave interference

Double the frequency of a sound wave in air and you halve its a. wavelength. b. speed. c. amplitude. d. all of these e. none of these

wavelength