Question 1

A sandbag in outer space moves at 3 m/s when it collides and sticks to a half-as-massive sandbag initially at rest. Compared with the kinetic energy of the moving sandbag before collision, the kinetic energy of the coupled sandbags after collision is

Accepted Answer

A)  one-third.
B)  two-thirds.
C)  three-quarters.
D)  not enough informationE) All of the above
F) A) and D)

Question 2

Discuss how energy conservation applies to a swinging pendulum. Where is potential energy the most? The least? Where is kinetic energy the most? The least? Where is the pendulum bob moving fastest? Slowest?

Accepted Answer

The swinging pendulum has the most gravi...

Question 3

The force of a falling apple hitting the ground depends upon

Accepted Answer

A)  the speed of the apple just before it hits.
B)  the time of contact with the ground.
C)  whether or not the apple bounces.
D)  all of the aboveE) B) and C)
F) None of the above

Question 4

Which has greater kinetic energy, a car traveling at 30 km/h or another car of half the mass traveling at 60 km/h?

Accepted Answer

A)  the 30-km/h car
B)  the 60-km/h car
C)  both have the same kinetic energyD) All of the above
E) B) and C)

Question 5

A diesel locomotive coasting at 10 km/h runs into a stationary flatcar. The locomotive weighs four times as much as the flatcar. How fast do the locomotive and flatcar move when they stick together upon collision?

Accepted Answer

Momentum before collision = mo...

Question 6

A cannonball fired from a long-barrel cannon will have a greater muzzle velocity because the cannonball receives a greater

Accepted Answer

A)  force.
B)  impulse.
C)  both
D)  neitherE) A) and D)
F) A) and C)

Question 7

Recoil is noticeable if we throw a heavy ball while standing on a skateboard. If instead we go through the throwing motion but hold onto the ball, without friction effects our net recoil will be

Accepted Answer

A)  zero.
B)  the same as before.
C)  small, but noticeable.D) All of the above
E) B) and C)

Question 8

Suppose an astronaut in outer space plays a solitary game of "throw, bounce, and catch" by tossing a ball against a very massive and perfectly elastic concrete wall.

Accepted Answer

A)  The astronaut will catch the ball on one bounce only.
B)  The astronaut will never catch the first bounce.
C)  The astronaut's time between catches will decrease as the game progresses.
D)  none of the aboveE) A) and B)
F) B) and D)

Question 9

The speed of a bullet fired from a gun will be about the same as the speed of the recoiling gun

Accepted Answer

A)  when momentum is conserved.
B)  because velocity is conserved.
C)  when both velocity and momentum are conserved.
D)  if the masses of the bullet and gun are equal.
E)  none of the aboveF) B) and C)
G) A) and E)

Question 10

A 1000-kg car moving at 10 m/s that brakes to a stop in 5 s has an average braking force of

Accepted Answer

A)  1000 N.
B)  2000 N.
C)  3000 N.
D)  4000 N.
E)  5000 N.F) B) and E)
G) A) and B)

Question 11

A 1-kg glider and a 2-kg glider both slide toward each other at 1 m/s on an air track. They collide and stick. The combined gliders move at

Accepted Answer

A)  0 m/s.
B)  1/2 m/s.
C)  1/3 m/s.
D)  1/6 m/s.
E)  1.5 m/s.F) B) and E)
G) A) and E)

Question 12

A diver who weighs 500 N steps off a diving board 10 m above the water hits the water with kinetic energy of

Accepted Answer

A)  10 J.
B)  500 J.
C)  510 J.
D)  5000 J.
E)  more than 5000 J.F) A) and E)
G) A) and D)

Question 13

Can an object have mechanical energy without having momentum? Momentum without having mechanical energy? Explain.

Accepted Answer

An object can have potential energy with...

Question 14

When a non-hybrid car brakes to a stop its kinetic energy transforms to

Accepted Answer

A)  stopping energy.
B)  potential energy.
C)  energy of motion.
D)  energy of rest.
E)  heat.F) B) and D)
G) C) and E)

Question 15

Lifting a 100-N load with 50 N of force lifts it

Accepted Answer

A)  half as high.
B)  as high.
C)  twice as highD) A) and B)
E) B) and C)

Question 16

If a charging rhinoceros has momentum, it must also have

Accepted Answer

A)  potential energy.
B)  kinetic energy.
C)  work.
D)  all of the aboveE) B) and D)
F) A) and C)

Question 17

A person on the edge of a roof throws a piece of tile downward that strikes the ground with 100 J of kinetic energy. Another identical tile is thrown upward with the same initial speed, and this too falls to the ground. Neglecting air resistance, the second tile hits the ground with a kinetic energy of

Accepted Answer

A)  less than 100 J.
B)  100 J.
C)  200 J.
D)  more than 200 J.
E)  none of the aboveF) A) and C)
G) C) and D)

Question 18

When an apple falls to the ground, momentum is transferred to the ground. The momentum absorbed by the ground is

Accepted Answer

A)  negligible compared to the momentum of the apple.
B)  greater than that of the apple if the apple bounces.
C)  greater than that of the apple in all cases.
D)  none of the aboveE) B) and D)
F) All of the above

Question 19

A common car engine is 20% efficient. When cruising, the car encounters an average retarding force of 1000 N. If the energy content of gasoline is 40 MJ/L, how many kilometers per liter does the car achieve?

Accepted Answer

A)  14 km/L
B)  12 km/L
C)  10 km/L
D)  8 km/L
E)  none of the aboveF) B) and E)
G) None of the above

Question 20

A 1-kg ball dropped from a height of 2 m rebounds only 1.5 m after hitting the ground. The amount of energy converted to heat is about

Accepted Answer

A)  0.5 J.
B)  1.0 J.
C)  1.5 J.
D)  2.0 J.
E)  more than 2.0 J.F) C) and E)
G) A) and D)

Exam 3: Momentum and Energy

The force of a falling apple hitting the ground depends upon

Correct Answer
verified

Discuss how energy conservation applies to a swinging pendulum. Where is potential energy the most? The least? Where is kinetic energy the most? The least? Where is the pendulum bob moving fastest? Slowest?

Correct Answer
verified
The swinging pendulum has the most gravi...
View Answer

Recoil is noticeable if we throw a heavy ball while standing on a skateboard. If instead we go through the throwing motion but hold onto the ball, without friction effects our net recoil will be

Correct Answer
verified

A common car engine is 20% efficient. When cruising, the car encounters an average retarding force of 1000 N. If the energy content of gasoline is 40 MJ/L, how many kilometers per liter does the car achieve?

Correct Answer
verified

A 1000-kg car moving at 10 m/s that brakes to a stop in 5 s has an average braking force of

Correct Answer
verified

Which has greater kinetic energy, a car traveling at 30 km/h or another car of half the mass traveling at 60 km/h?

Correct Answer
verified

When an apple falls to the ground, momentum is transferred to the ground. The momentum absorbed by the ground is

Correct Answer
verified

A sandbag in outer space moves at 3 m/s when it collides and sticks to a half-as-massive sandbag initially at rest. Compared with the kinetic energy of the moving sandbag before collision, the kinetic energy of the coupled sandbags after collision is

Correct Answer
verified

A 1-kg glider and a 2-kg glider both slide toward each other at 1 m/s on an air track. They collide and stick. The combined gliders move at

Correct Answer
verified

A cannonball fired from a long-barrel cannon will have a greater muzzle velocity because the cannonball receives a greater

Correct Answer
verified

Can an object have mechanical energy without having momentum? Momentum without having mechanical energy? Explain.

Correct Answer
verified
An object can have potential energy with...
View Answer

A 1-kg ball dropped from a height of 2 m rebounds only 1.5 m after hitting the ground. The amount of energy converted to heat is about

Correct Answer
verified

A diesel locomotive coasting at 10 km/h runs into a stationary flatcar. The locomotive weighs four times as much as the flatcar. How fast do the locomotive and flatcar move when they stick together upon collision?

Correct Answer
verified
Momentum before collision = mo...
View Answer

The speed of a bullet fired from a gun will be about the same as the speed of the recoiling gun

Correct Answer
verified

A diver who weighs 500 N steps off a diving board 10 m above the water hits the water with kinetic energy of

Correct Answer
verified

Correct Answer
verified

If a charging rhinoceros has momentum, it must also have

Correct Answer
verified

Lifting a 100-N load with 50 N of force lifts it

Correct Answer
verified

Suppose an astronaut in outer space plays a solitary game of "throw, bounce, and catch" by tossing a ball against a very massive and perfectly elastic concrete wall.

Correct Answer
verified

When a non-hybrid car brakes to a stop its kinetic energy transforms to

Correct Answer
verified

Exam 3: Momentum and Energy

The force of a falling apple hitting the ground depends upon

Correct AnswerverifiedShow Answer

Discuss how energy conservation applies to a swinging pendulum. Where is potential energy the most? The least? Where is kinetic energy the most? The least? Where is the pendulum bob moving fastest? Slowest?

Correct AnswerverifiedThe swinging pendulum has the most gravi...View AnswerShow Answer

Recoil is noticeable if we throw a heavy ball while standing on a skateboard. If instead we go through the throwing motion but hold onto the ball, without friction effects our net recoil will be

Correct AnswerverifiedShow Answer

A common car engine is 20% efficient. When cruising, the car encounters an average retarding force of 1000 N. If the energy content of gasoline is 40 MJ/L, how many kilometers per liter does the car achieve?

Correct AnswerverifiedShow Answer

A 1000-kg car moving at 10 m/s that brakes to a stop in 5 s has an average braking force of

Correct AnswerverifiedShow Answer

Which has greater kinetic energy, a car traveling at 30 km/h or another car of half the mass traveling at 60 km/h?

Correct AnswerverifiedShow Answer

When an apple falls to the ground, momentum is transferred to the ground. The momentum absorbed by the ground is

Correct AnswerverifiedShow Answer

A sandbag in outer space moves at 3 m/s when it collides and sticks to a half-as-massive sandbag initially at rest. Compared with the kinetic energy of the moving sandbag before collision, the kinetic energy of the coupled sandbags after collision is

Correct AnswerverifiedShow Answer

A 1-kg glider and a 2-kg glider both slide toward each other at 1 m/s on an air track. They collide and stick. The combined gliders move at

Correct AnswerverifiedShow Answer

A cannonball fired from a long-barrel cannon will have a greater muzzle velocity because the cannonball receives a greater

Correct AnswerverifiedShow Answer

Can an object have mechanical energy without having momentum? Momentum without having mechanical energy? Explain.

Correct AnswerverifiedAn object can have potential energy with...View AnswerShow Answer

A 1-kg ball dropped from a height of 2 m rebounds only 1.5 m after hitting the ground. The amount of energy converted to heat is about

Correct AnswerverifiedShow Answer

A diesel locomotive coasting at 10 km/h runs into a stationary flatcar. The locomotive weighs four times as much as the flatcar. How fast do the locomotive and flatcar move when they stick together upon collision?

Correct AnswerverifiedMomentum before collision = mo...View AnswerShow Answer

The speed of a bullet fired from a gun will be about the same as the speed of the recoiling gun

Correct AnswerverifiedShow Answer

A diver who weighs 500 N steps off a diving board 10 m above the water hits the water with kinetic energy of

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

If a charging rhinoceros has momentum, it must also have

Correct AnswerverifiedShow Answer

Lifting a 100-N load with 50 N of force lifts it

Correct AnswerverifiedShow Answer

Suppose an astronaut in outer space plays a solitary game of "throw, bounce, and catch" by tossing a ball against a very massive and perfectly elastic concrete wall.

Correct AnswerverifiedShow Answer

When a non-hybrid car brakes to a stop its kinetic energy transforms to

Correct AnswerverifiedShow Answer

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Correct Answer
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The swinging pendulum has the most gravi...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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An object can have potential energy with...
View Answer

Correct Answer
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Momentum before collision = mo...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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