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Physics > Test 2: Review A > Flashcards

Test 2: Review A Flashcards

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1
Q

Which of the following has the largest momentum relative to the Earth?
A) a dog running down the street
B) a Mack truck parked in a parking lot
C) a tightrope walker crossing Niagara Falls
D) the Science building on campus
E) a pickup truck speeding along a highway

A

E) a pickup truck speeding along a highway

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2
Q

The difference between impulse and impact force involves the
A) time the force acts.
B) distance the force acts.
C) difference between acceleration and velocity.
D) mass and its effect on resisting a change in momentum.

A

A) time the force acts.

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3
Q

Suppose that a tiny gun made of a strong but very light material fires a bullet that is more massive than the gun itself. For such a weapon
A) conservation of momentum would not hold.
B) recoil problems would be lessened.
C) conservation of energy would not hold.
D) the target would be safer than the shooter.
E) both conservation of energy and momentum would not hold.

A

D) the target would be safer than the shooter.

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4
Q

Two objects have the same size and shape, but one is much heavier than the other. When they are dropped simultaneously from a tower, they reach the ground at the same time, but the heavier one has a greater
A) momentum.
B) acceleration.
C) speed.
D) all of these
E) none of these

A

A) momentum.

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4
Q

When you jump from an elevated position you usually bend your knees upon reaching the ground. By doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. In this way the average force your body experiences is
A) less than 1/10 as great.
B) about 1/10 as great.
C) more than 1/10 as great.
D) about 10 times as great.

A

B) about 1/10 as great.

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5
Q

The force on an apple hitting the ground depends upon
A) the speed of the apple just before it hits.
B) whether or not the apple bounces.
C) the time of impact with the ground.
D) all of these

A

D) all of these

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6
Q

A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5-kg bowling ball initially at rest. The bowling ball and putty then move with a momentum of
A) 0 kg m/s.
B) 5 kg m/s.
C) 1 kg m/s.
D) 2 kg m/s.
E) more than 5 kg m/s.

A

C) 1 kg m/s.

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7
Q

The force that accelerates a rocket in outer space is exerted on the rocket by the
A) exhaust gases.
B) rocket’s wings.
C) rocket’s nose cone.
D) atmospheric pressure.
E) none of these

A

A) exhaust gases.

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8
Q

A large metal ball is shot from a cannon with a short barrel. If the same ball were to be shot from cannon with a longer barrel, its muzzle velocity would be
A) more.
B) less.
C) the same.
D) impossible to determine without additional information.

A

A) more.

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9
Q

A 5-kg shark swimming at a speed of 1 m/s swallows an absent-minded 1-kg fish swimming toward it at 4 m/s. The speed of the shark after this meal is
A) 1/6 m/s.
B) 2/3 m/s.
C) 1/5 m/s.
D) 3/2 m/s.
E) 1/2 m/s.

A

A) 1/6 m/s.

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10
Q

A 5000-kg freight car runs into a 10,000-kg freight car at rest. They couple upon collision and move with a speed of 2 m/s. What was the initial speed of the 5000-kg car?
A) 5 m/s
B) 8 m/s
C) 6 m/s
D) 4 m/s
E) none of these

A

C) 6 m/s

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11
Q

If you push for a half hour or a whole hour against a stationary wall,
A) no work is done in either case.
B) twice as much work is done during the half hour.
C) half as much work is done during the half hour.
D) it is impossible to determine how much work is done.

A

A) no work is done in either case.

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12
Q

If you find that twice as much work is needed to perform a task but it takes twice as much time, the amount of power required is
A) sixteen times as much.
B) twice as much.
C) four times as much.
D) unchanged.

A

D) unchanged.

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13
Q

An object lifted 10 meters gains 200 J of potential energy. If the same object is lifted 20 meters, its potential energy gain is
A) half as much.
B) four times as much.
C) the same.
D) twice as much.
E) more than four times as much.

A

D) twice as much.

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14
Q

An object may have potential energy because of its
A) acceleration.
B) momentum.
C) speed.
D) location.
E) none of these

A

D) location.

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15
Q

When bullets are fired from an airplane in the forward direction, the momentum of the airplane will be
A) unchanged.
B) increased.
C) decreased.

A

C) decreased.

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16
Q

A hydraulic press, like an inclined plane, is capable of increasing energy.
A) sometimes false
B) always false
C) sometimes true
D) always true

A

B) always false

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17
Q

After rolling halfway down an incline a marble’s kinetic energy is
A) the same as its potential energy.
B) greater than its potential energy.
C) less than its potential energy.
D) impossible to determine.
B) greater than its potential energy.
C) less than its potential energy.
D) impossible to determine.

A

A) the same as its potential energy.

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18
Q

No work is done by gravity on a bowling ball that rolls along a bowling alley because
A) no distance is covered by the ball.
B) no force acts on the ball.
C) the force on the ball is at right angles to the ball’s motion.
D) its kinetic energy remains constant.
E) no potential energy is being converted to kinetic energy.

A

C) the force on the ball is at right angles to the ball’s motion.

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19
Q

A car moves 4 times as fast as another identical car. Compared to the slower car, the faster car has
A) 4 times the KE.
B) 12 times the KE.
C) 16 times the KE.
D) 8 times the KE.

A

C) 16 times the KE.

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20
Q

A jack system will increase the potential energy of a heavy load by 1000 J with a work input of 2000 J. The efficiency of the jack system is
A) 20%.
B) 50%.
C) 80%.
D) 10%.
E) Not enough information is given.

A

B) 50%.

21
Q

A car that travels twice as fast as another when braking to a stop will skid
A) twice as far.
B) four times as far.
C) depends on the mass of the cars

A

B) four times as far.

21
Q

Whereas impulse involves the time that a force acts, work involves the
A) time and distance that a force acts.
B) distance that a force acts.
C) acceleration that a force produces.

A

B) distance that a force acts.

22
Q

If an object has kinetic energy, then it also must have
A) force.
B) impulse.
C) acceleration.
D) momentum.
E) none of these

A

D) momentum.

23
Q

Compared to the recoiling rifle, the bullet fired has
A) a smaller speed.
B) a greater momentum.
C) a greater kinetic energy.
D) all of the above

A

C) a greater kinetic energy.

24
Q

Horses that move with the fastest linear speed on a merry-go-round are located
A) near the outside.
B) near the center.
C) anywhere, because they all move at the same speed.

A

A) near the outside.

25
Q

If you replace the wheels and tires of your car with new ones having greater diameters, all of your speedometer readings thereafter will
A) increase
B) decrease.
C) remain the same.

A

B) decrease.

26
Q

A coin and a ring roll down an incline starting at the same time. The one to reach the bottom first will be the
A) ring.
B) coin.
C) Both reach the bottom at the same time.

A

B) coin.

27
Q

The long, heavy tail of a spider monkey enables the monkey to easily vary its
A) center of gravity.
B) weight.
C) inertia.
D) momentum.
E) none of these

A

A) center of gravity.

28
Q

The chef at the infamous Fattening Tower of Pizza tosses a spinning disk of uncooked pizza dough into the air. The disk’s diameter increases during the flight, while its rotational speed
A) increases.
B) decreases.
C) remains constant.

A

B) decreases.

29
Q

If the planet Jupiter underwent gravitational collapse, its rate of rotation about its axis would
A) increase.
B) stay the same.
C) decrease.
D) more information needed

A

A) increase.

30
Q

Two people are balanced on a see-saw. If one person leans toward the center of the see-saw, that person’s end of the see-saw will
A) rise and then fall.
B) fall and then rise.
C) stay at the same level.
D) rise.
E) fall.

A

D) rise.

31
Q

The vibrations of a transverse wave move in a direction
A) at right angles to the direction of wave travel.
B) along the direction of wave travel.
C) that changes with speed.

A

A) at right angles to the direction of wave travel.

32
Q

The frequency of a simple pendulum depends on
A) its mass.
B) its length.
C) all of these

A

B) its length.

33
Q

An object that completes 100 vibrations in 5 seconds has a period of
A) 2 seconds.
B) 0.5 second.
C) 1 second.
D) None of the above choices are correct.

A

D) None of the above choices are correct.

34
Q

A wave barrier is produced when a wave source moves
A) as fast as the waves it produces.
B) faster than the waves it produces.
C) nearly as fast as the waves it produces.

A

A) as fast as the waves it produces.

35
Q

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) 40 m/s
C) 10 m/s
D) 20 m/s
E) more than 40 m/s

A

D) 20 m/s

36
Q

For light, a red shift indicates that the light source is moving
A) away from you.
B) toward you.
C) at right angles to you.
D) actually, all of these
E) none of these

A

A) away from you.

37
Q

Some of a wave’s energy dissipates as heat. In time, this will reduce the wave’s
A) speed.
B) wavelength.
C) frequency.
D) period.
E) amplitude.

A

E) amplitude.

38
Q

We are best at hearing
A) ultrasonic sound.
B) infrasonic sound.
C) both infrasonic and ultrasonic sounds.
D) None of the above choices are true.

A

D) None of the above choices are true.

39
Q

Sound travels faster in
A) air.
B) a vacuum.
C) water.
D) steel.
E) Sound travels at about the same speed in all of the above media.

A

D) steel.

40
Q

Sound travels faster in air if the air temperature is
A) warm.
B) average.
C) cold.

A

A) warm.

41
Q

The explanation for refraction must involve a change in
A) frequency.
B) speed.
C) wavelength.
D) All of the above choices are true.
E) None of the above choices are true.

A

B) speed.

42
Q

The energy of sound in air eventually becomes
A) increased internal energy of the air.
B) cancelled by destructive interference.
C) weaker and weaker until it disappears.
D) cancelled by both destructive and constructive interference.

A

A) increased internal energy of the air.

43
Q

A base fiddle is louder than a harp because of its
A) sounding board.
B) thicker strings.
C) lower pitch.
D) All of the above are true.
E) None of the above are true.

A

A) sounding board.

44
Q

Caruso is said to have made a crystal chandelier shatter with his voice. This is a demonstration of
A) interference.
B) an echo.
C) sound refraction.
D) beats.
E) resonance.

A

E) resonance.

45
Q

For AM radio, the A stands for
A) amplitude.
B) agony.
C) acceleration.
D) authorized.
E) almost.

A

A) amplitude.

46
Q

On some days, air nearest the ground is colder than air that is higher up. On one of these days, sound waves
A) tend to be refracted upward.
B) travel without refraction.
C) tend to be refracted downward.

A

C) tend to be refracted downward.

47
Q

Inhaling helium increases the pitch of your voice. The reason for this is that sound travels
A) slower in helium than in air.
B) faster in helium than in air.
C) the same speed in helium, but the wavelength is greater.

A

B) faster in helium than in air.

48
Q

The beat frequency produced when a 240 hertz tuning fork and a 246 hertz tuning fork are sounded together is
A) 240 hertz.
B) 245 hertz.
C) 6 hertz.
D) 12 hertz.
E) None of the above choices are correct.

A

C) 6 hertz.

Physics (15 decks)

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