Physics Exam

The period of an ocean wave is 10 seconds. What is the wave's frequency? A) 10 Hz B) 0.1 Hz C) 0.5 Hz D) 1.0 Hz E) 20 Hz

.1 hz

When an object reaches terminal velocity its acceleration is __________. A) 0 m/s2 . B) 4.9 m/s2 . C) 9.8 m/s2

0 m/s 2

A weight on the end of a spring bobs up and down one complete cycle every 2 seconds. Its frequency is __________. A) 0.5 hertz. B) 2 hertz. C) none of the above

0.5 hz

A certain ocean wave has a frequency of 0.05 hertz and a wavelength of 10 meters. What is the wave's speed? A) 10 m/s B) 0.05 m/s C) 0.5 m/s D) 0.005 m/s E) 200 m/s

0.5 m/s

A tuning fork of frequency 200 Hz will resonate if a sound wave incident on it has a frequency of __________. A) 400 Hz. B) 100 Hz. C) both A and B D) none of the above

100 hz

Compared to a sound of 40 decibels, a sound of 60 decibels is __________. A) 200 times the intensity. B) 100 times the intensity. C) 20 times the intensity.

100 times the intensity

A 1056-Hz tuning fork is sounded at the same time a piano note is struck. You hear three beats per second. What is the frequency of the piano string? A) 1056 Hz B) 2112 Hz C) 1053 Hz D) 1061 Hz

1053

A 340-Hz sound wave travels at 340 m/s in air, with a wavelength of __________. A) 100 m. B) 1 m. C) 10 m. D) 1000 m. E) none of the above

1m

A leaf on a pond oscillates up and down two complete cycles each second as a water wave passes. What is the wave's frequency? A) 2 hertz B) 6 hertz C) 1 hertz D) 0.5 hertz E) 3 hertz

2 hertz

The amplitude of a particular wave is 1 meter. The crest-to-trough distance of the disturbance is __________. A) 2 m. B) 0.5 m. C) 1 m. D) none of the above

2 m

Two waves arrive at the same place at the same time exactly in phase with each other. Each wave has an amplitude of 1 m. The resulting wave has an amplitude of __________. A) 2 m. B) 0.25 m. C) 1 m. D) 0.5 m. E) 4 m.

2 m

A weight on the end of a spring bobs up and down one complete cycle every 2 seconds. Its period is __________. A) 2 sec. B) 0.5 sec. C) none of the above

2 sec

A 10-N force and a 30-N force act on an object in opposite directions. What is the net force on the object? A) 30 N B) 10 N C) 20 N D) 40 N E) none of the above

20 n

If you pull horizontally on a crate with a force of 150 N and the crate doesn't move, the friction force must be 150 N. Now if you pull with 250 N so the crate slides at constant velocity, the friction force is __________. A) 250 N. B) more than 250 N. C) more than 150 N but less than 250 N

250 n

A wave has two up and two down cycles each second. If the wave travels with an average speed of 6 m/s, its wavelength is __________. A) 2 m. B) 6 m. C) 0.5 m. D) 3 m. E) 1 m.

3 m

Compared to a sports car moving at 30 km/h, the same sports car moving at 90 km/h has __________. A) three times as much momentum. B) the same momentum. C) twice as much momentum

3 x as much momentum

A karate chop delivers a blow of 3000 N to a board that breaks. The force that acts on the hand during this feat __________. A) is 3000 N. B) cannot be determined. C) is less than 3000 N. D) is more than 3000 N.

3000 n

A sound wave that has a wavelength of 1 meter in room-temperature air (speed 340 m/s) has a frequency of about __________. A) 340 Hz. B) 1020 Hz. C) 680 Hz. D) none of these

340 hz

You pull horizontally on a 50-kg crate with a force of 500 N, and the friction force on the crate is 300 N. The acceleration of the crate is __________. A) zero. B) 5 m/s 2 . C) 4 m/s 2 . D) 2 m/s 2

4 m/s 2

A 10-N falling object encounters 6 N of air resistance. The magnitude of the net force on the object is __________. A) 10 N. B) 0 N. C) 6 N. D) 4 N. E) none of the above

4 n

Two people pull on a rope in a tug-of-war. Each pulls with 400 N of force. What is the tension in the rope? A) 600 N B) 400 N C) 800 N D) Zero E) none of the above

400 n

An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic sound that travels 1530 m/s in seawater, and finds a 6-second time delay of the echo to the ocean floor and back. The ocean depth there is __________. A) 2040 m. B) 1020 m. C) 4590 m. D) 9180 m. E) none of the above

4590 m

Beats are produced when two tuning forks, one of frequency 240 Hz and the other of frequency 246 Hz, are sounded together. The frequency of the beats is __________. A) 12 Hz. B) 6 Hz. C) 245 Hz. D) 240 Hz. E) none of the above

6 hz

A wave travels an average distance of 6 meters in 1 second. What is the wave's velocity? A) 6 m/s B) 3 m/s C) More than 6 m/s D) Less than 0.2 m/s E) 1 m/s

6 m/s

The speed of sound in dry air at 20 degrees Celsius is 340 m/s. How far away is a jet plane when you notice a 2-second delay between seeing the plane and hearing it? A) 680 m B) 6800 m C) 340 m D) 40 m E) 20 m

680 m

A tennis ball and a solid steel ball the same size are dropped at the same time. In the absence of air resistance, which ball has the greater acceleration? A) The tennis ball B) Nonsense! They both have the same acceleration. C) The steel ball

Nonsense! They both have the same acceleration.

If a horse pulls on a wagon at rest, the wagon pulls back equally as much on the horse. Will the wagon be set into motion? A) Yes, because there is a time delay between action and reaction. B) Yes, because there is a net force acting on the wagon. C) Yes - The horse's pull on the wagon is larger than the wagon's pull on the horse. D) No, because the forces cancel each other.

Yes, because there is a net force acting on the wagon.

Your friend says that the heavyweight champion of the world cannot exert a force of 50 N on a piece of tissue paper with his best punch. The tissue paper is held in midair, no wall, no tricks. A) You have reservations about this claim. B) You agree that it can't be done. C) You disagree, for a good punch easily delivers this much force.

You agree that it can't be done.

Unlike a transverse wave, a longitudinal wave has no __________. A) frequency. B) wavelength. C) speed. D) amplitude. E) A longitudinal wave has all of the above.

a longitudinal wave has all of the above

what do sound waves require?

a medium

What happens when an airplane is flying faster than the speed of sound? A) It becomes very quiet inside the plane B) Nobody can hear the plane fly overhead C) A shock wave is produced D) There is no sonic boom E) none of the above

a shock wave is produced

Sound waves cannot travel in __________. A) steel. B) air. C) a vacuum. D) water. E) Sound can travel in all of the above.

a vacuum

Which of the following would exert the least pressure on the ground? A) A woman standing on skis B) A woman standing in running shoes C) A woman standing in high heel shoes

a woman standing on skis

An object has a constant mass. A constant force on the object produces constant __________. A) acceleration. B) velocity. C) both A and B D) none of the above

acceleration

Net forces produce __________. A) masses. B) accelerations. C) velocities. D) forces. E) none of the above

accelerations

Sound waves in air are a series of __________. A) periodic condensations and rarefactions. B) periodic disturbances. C) high- and low-pressure regions. D) all of the above E) none of the above

all of the above

Standing waves can be set up __________. A) in organ pipes. B) by blowing across the top of a soda bottle. C) on strings of musical instruments. D) all of the above E) none of the above

all of the above

Resonance occurs when __________. A) the amplitude of a wave is amplified. B) sound changes speed in going from one medium to another. C) an object is forced to vibrate at its natural frequency. D) sound makes multiple reflections. E) all of the above

an object is forced to vibrate at its natural frequency

An archer shoots an arrow. Consider the action force to be the bow string against the arrow. The reaction to this force is the __________. A) grip of the archer's hand on the bow. B) air resistance against the bow. C) weight of the arrow. D) arrow's push against the bowstring. E) friction of the ground against the archer's feet.

arrow's push against the bowstring.

When the handle of a tuning fork is held solidly against a table, the sound becomes louder and the length of time the fork vibrates __________. A) becomes longer. B) remains the same. C) becomes shorter.

becomes shorter

The impulse of an object is equal to the __________. A) object's mass times the force acting on it. B) force acting on it. C) change in momentum. D) velocity change of the object. E) force acting on it times its velocity.

change in momentum

Suppose a particle is accelerated through space by a constant 10-N force. Suddenly the particle encounters a second force of 10-N in a direction opposite to that of the first force. The particle __________. A) continues at the speed it had when it encountered the second force. B) gradually decelerates to a halt. C) theoretically accelerates to speeds approaching the speed of light. D) is brought to a rapid halt. E) none of the above

continues at the speed it had when it encountered the second force.

A car blows its horn as it passes. As it moves away from you, the frequency of the horn seems to __________. A) stay the same. B) decrease. C) increase.

decrease

How does acceleration of an object change in relation to the net force acting on it? It is __________. A) inversely proportional. B) Acceleration doesn't depend on force at all. C) directly proportional.

directly proportional

light waves are what type of waves?

electromagnetic

A person uses 360 N of force to lift a box 2.4 m. How much work did she use?

f = 360 N d = 2.4 m w = ? J w - f x d w = 360N x 2.4 m w = 864 J

According to Newton's third law, if you push gently on something, it will push __________. A) gently on you. B) on something only under the right conditions. C) gently on something else. D) on you only if you aren't moving.

gently on you

If you double the frequency of a vibrating object, its period __________. A) is quartered. B) doubles. C) halves.

halves

Beats can be heard when two tuning forks __________. A) have almost the same frequency and are sounded together. B) have the same frequency and are sounded together. C) are sounded together. D) all of the above E) none of the above

have almost the same frequency and are sounded together

Suppose a bug is jiggling up and down and swimming towards you at the same time. Compared to the frequency at which the bug is emitting waves, the frequency of the waves reaching you is __________. A) just the same. B) higher. C) lower.

higher

In which one of the following does sound travel the fastest? A) Steam B) Sound travels at the same speed in each of the above. C) Water D) Ice

ice

Forces always occur __________. A) as single quantities. B) by themselves. C) in pairs. D) in triplets.

in pairs

The reason modern cars have crumple zones is that they __________. A) increase the force of impact in a collision. B) decrease the impulse in a collision. C) are made from cheap materials. D) decrease the momentum of a collision. E) increase the time of impact in a collision.

increase the time of impact in a collision.

What is the mechanical advantage of a ramp that is 10 meters long and 5 meters high?

input distance - 10 output distance - 5 ma = ID/OD = 10/5 ma = 2 m

The phenomenon of beats results from sound __________. A) reflection. B) interference. C) refraction. D) all of the above E) none of the above

interference

When two waves meet, their combined effect is called ...?

interference

A sonic boom __________. A) is swept continuously behind a plane flying faster than the speed of sound. B) is produced by subsonic projectiles as well as subsonic aircraft. C) is produced only at the moment a plane breaks through the sound barrier. D) all of the above E) none of the above

is swept continuously behind a plane flying faster than the speed of sound.

If the force acting on a cart doubles, what happens to the cart's acceleration? A) It stays the same. B) It halves. C) It doubles. D) It quarters. E) It quadruples.

it doubles

Suppose a cart is being moved by a force. If suddenly a load is dumped into the cart so that the cart's mass doubles, what happens to the cart's acceleration? A) It doubles. B) It quadruples. C) It halves. D) It stays the same. E) It quarters.

it halves

When a sound source moves towards you, what happens to the wave speed? A) It stays the same. B) It decreases. C) It increases.

it stays the same

Energy is measured in ...?

joules

A person on a bicycle is struck by a car. Compared to the acceleration of the car, the acceleration of the bicycle is __________. A) larger. B) the same. C) smaller. D) Need more information to say

larger

A sound wave is a __________. A) transverse wave. B) longitudinal wave. C) standing wave. D) shock wave. E) none of the above

longitudinal wave

Mechanical advantage applies to ...?

machines

If the sounding board were left out of a music box, it would __________. A) sound the same as usual. B) make little "plinks" that you could hardly hear. C) not sound at all.

make little plinks that you could hardly hear

Determine the gravitational potential energy of 25.5 kg boulder on a 630 m hill.

mass-25.5 kg h-630m ke-?J ke- 1/2 mv squared ke-5.5 x 205 squared/ / 2 ke-1,155.7 J

Distance is measured in ...?

meters

Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has a higher __________. A) momentum. B) speed. C) acceleration. D) all of the above E) none of the above

momentum

Suppose the force of friction on a sliding object is 10 N. The force needed to accelerate the object is __________. A) less than 10 N. B) more than 10 N. C) 10 N.

more than 10 n

An explosion occurs 34 km away. Given that sound travels at 340 m/s, the time it takes for the sound to reach you is __________. A) 20 sec. B) 10 sec. C) 1 sec. D) 0.1 sec. E) more than 20 sec.

more than 20 sec

Force is measured in ...?

newtons

Can sound waves travel in a vacuum?

no

A rocket is able to accelerate in the vacuum of space when it fires its engines. The force that propels the rocket is the force __________. A) of the exhaust gases pushing on the rocket. B) of the rocket pushing on the exhaust gases. C) neither A nor B

of the exhaust gases pushing on the rocket.

A high school student hits a nail with a hammer. During the collision, there is a force __________. A) on the hammer but not on the nail. B) on the nail and also on the hammer. C) on the nail but not on the hammer.

on the nail and also on the hammer.

During a single period, the distance traveled by a wave is __________. A) one-half wavelength. B) one wavelength. C) two wavelengths.

one wave length

what is the mechanical advantage of a machine if you apply 300 N of force to lift a 1200 N object?

output force - 1200 N input force -300N ma= 1200N/300N ma = 4

A person has a power output of 850 W. If the work is done over 40 s, how much work is done?

p = 580 W t = 40 s W = ? J p = w/t = 40 s x 580 W = w 23, 200 J = W

Potential energy is due to...?

position

A stretched string has which type of energy?

potential

You dip your finger repeatedly into water and make waves. If you dip your finger more frequently, the wavelength of the waves __________. A) stays the same. B) shortens. C) lengthens.

shortnes

Compared to the speed of light, sound travels __________. A) faster. B) at about the same speed. C) slower.

slower

When a pendulum clock is taken from sea level to the top of a high mountain where g is slightly reduced, it will __________. A) speeds up B) slows down. C) neither speeds up nor slows down.

slows down

A Ping-Pong® ball launcher is fired. Compared to the change in velocity of the ball, the change in velocity of the launcher is __________. A) the same B) larger C) smaller

smaller

Which of the following would be most likely to transmit sound the best? A) Steel in a bridge B) Air in your classroom C) Water in the ocean D) Water in a swimming pool E) Wood in a cabinet

steel in a bridge

An aircraft that flies faster than the speed of sound is said to be __________. A) supersonic. B) subsonic. C) none of the above

supersonic

The speed of a sound wave depends on __________. A) the air temperature. B) its frequency. C) its wavelength. D) all of the above E) none of the above

the air temperature

The reason a tennis ball and a solid steel ball will accelerate at the same rate, in the absence of air resistance, is that __________. A) the ball with the larger force has the smaller mass. B) the force acting on them is the same. C) they have the same mass. D) the ball with the larger force also has the larger mass. E) none of the above

the ball with the larger force also has the larger mass.

A heavy person and a light person parachute together and wear the same size parachutes. Assuming they open their parachutes at the same time, which person takes longer to reach the ground? A) the light person B) the heavy person C) Neither -- they both reach the ground together

the light person

A Ping-Pong® ball launcher is fired. Compared to the force on the ball, the force on the launcher is __________. A) the same. B) smaller. C) larger.

the same

A Ping-Pong® ball launcher is fired. Compared to the impulse on the ball, the impulse on the launcher is __________. A) larger. B) smaller. C) the same.

the same

A person on a bicycle is struck by a car. Compared to the force on the car, the force on the bicycle is __________. A) the same. B) larger. C) Need more information to say D) smaller.

the same

A 10-kg brick and a 1-kg book are dropped in a vacuum. The acceleration of the 10-kg brick has __________. A) 10 times as much as the acceleration of 1-kg book. B) zero. C) the same acceleration as the 1-kg book.

the same acceleration of a 1-kg book.

A tennis ball and a solid steel ball the same size are dropped at the same time. Which ball has the greater force acting on it? A) the tennis ball B) Nonsense! They both have the same force acting on them. C) the steel ball

the steel ball

A wave created by shaking a rope up and down is called a __________. A) transverse wave. B) Doppler wave. C) longitudinal wave. D) constructive wave. E) standing wave.

transverse wave

Sound waves can interfere with one another so that no sound results. A) False B) True

true

Sound waves are produced by __________. A) vibrating objects. B) soft objects. C) radio stations. D) objects under pressure. E) none of the above

vibrating objects

The source of all wave motion is a __________. A) vibration. B) region of variable high and low pressure. C) movement of matter. D) harmonic object.

vibration

Most waves are caused by...?

vibrations

It takes 250 J of work to lift an object 2 meters. If this is done in 5 seconds, what is the power output?

w = 250 J d = 2m t = 5 s p = ? W p = w/t = 250 J/ 5 s p = 50 W

A push on a 1-kilogram brick accelerates the brick. Neglecting friction, to equally accelerate a 100-kilogram brick, one would have to push __________. A) with 10 times as much force. B) with 100 times as much force. C) with just as much force. D) with one tenth the amount of force. E) none of the above

with 100x as much force