Exam 2 lon Capa Exam Questions and
Answers
According to the definition of work, pushing on a rock accomplishes no work unless
there is - ANSWER-movement
When you do work on something, you give it energy
A. always
B. sometimes
C. often
D. never - ANSWER-A. always
No work is done by gravity on a bowling ball
A. the gravitational force on the ball is not in the same direction that it moves
B. no gravitational force acts on the ball.
C. little distance is covered by the ball
D. the ball's speed remains constant. - ANSWER-A
A 1000-kg car and a 2000-kg car are hoisted to the same height above the ground.
Raising the more massive car requires
A. 1/4 the amount of work
B. 1/2 the amount of work
C. the same amount of work
D. twice as much work.
E. four times as much work. - ANSWER-D
Which task requires more work?
A. lifting a 25-kg sack 4 meters
B. lifting a 50-kg sack 2 meters
C. both require the same work. - ANSWER-C
The unit kilowatt-hour is a unit of
A. power
B. time
C. energy
D. momentum. - ANSWER-C
You are carrying groceries up the stairs to your apartment. If you had made the same
trip in half the time, you would have expended
A. 1/4 as much power
B. 1/2 as much power
, C. the same amount of power
D. twice as much power.
E. four times as much power. - ANSWER-D
What is the difference between energy and power?
A. Power is measured in joules and energy is measured in watts
B. Power is used to describe energy of light, while the term energy has a broader
meaning
C. Power is the rate at which energy is used, so its units are a unit of energy divided by
a unit of time
D. There's no difference: Energy and power are different names for the same thing -
ANSWER-C
A book is sitting on the edge of a tall shelf. As it begins to fall its "________a_________
" is changed to " ________b_________-". - ANSWER-a. gravitational potential energy
b. kinetic energy
A block is compressed against a spring and speeds off when released. As this happens,
" ____a_____" is changed to "
____b______". - ANSWER-a. spring potential energy
b. kinetic energy
In the core of the Sun, nuclear fusion reactions convert "_____a______" into
"____b_____". - ANSWER-a. nuclear energy
b. radiant energy
When Joshua applies the brakes to stop his speeding bicylce, the brake pads change "
____a_____" into "____b______". - ANSWER-a. kinetic energy
b. thermal energy
A roller coaster coasts up a hill and slows down as "____a______" is changed into
"____b_____ " - ANSWER-a. kinetic energy
b. gravitational potential energy
An object has gravitational potential energy due to its
A. momentum
B. speed
C. acceleration
D. location. - ANSWER-D
Relative to an initial height, an object raised twice as high has gravitational potential
energy that is
A. 1/4 as much
B. half as much
C. the same.
D. twice as much
Answers
According to the definition of work, pushing on a rock accomplishes no work unless
there is - ANSWER-movement
When you do work on something, you give it energy
A. always
B. sometimes
C. often
D. never - ANSWER-A. always
No work is done by gravity on a bowling ball
A. the gravitational force on the ball is not in the same direction that it moves
B. no gravitational force acts on the ball.
C. little distance is covered by the ball
D. the ball's speed remains constant. - ANSWER-A
A 1000-kg car and a 2000-kg car are hoisted to the same height above the ground.
Raising the more massive car requires
A. 1/4 the amount of work
B. 1/2 the amount of work
C. the same amount of work
D. twice as much work.
E. four times as much work. - ANSWER-D
Which task requires more work?
A. lifting a 25-kg sack 4 meters
B. lifting a 50-kg sack 2 meters
C. both require the same work. - ANSWER-C
The unit kilowatt-hour is a unit of
A. power
B. time
C. energy
D. momentum. - ANSWER-C
You are carrying groceries up the stairs to your apartment. If you had made the same
trip in half the time, you would have expended
A. 1/4 as much power
B. 1/2 as much power
, C. the same amount of power
D. twice as much power.
E. four times as much power. - ANSWER-D
What is the difference between energy and power?
A. Power is measured in joules and energy is measured in watts
B. Power is used to describe energy of light, while the term energy has a broader
meaning
C. Power is the rate at which energy is used, so its units are a unit of energy divided by
a unit of time
D. There's no difference: Energy and power are different names for the same thing -
ANSWER-C
A book is sitting on the edge of a tall shelf. As it begins to fall its "________a_________
" is changed to " ________b_________-". - ANSWER-a. gravitational potential energy
b. kinetic energy
A block is compressed against a spring and speeds off when released. As this happens,
" ____a_____" is changed to "
____b______". - ANSWER-a. spring potential energy
b. kinetic energy
In the core of the Sun, nuclear fusion reactions convert "_____a______" into
"____b_____". - ANSWER-a. nuclear energy
b. radiant energy
When Joshua applies the brakes to stop his speeding bicylce, the brake pads change "
____a_____" into "____b______". - ANSWER-a. kinetic energy
b. thermal energy
A roller coaster coasts up a hill and slows down as "____a______" is changed into
"____b_____ " - ANSWER-a. kinetic energy
b. gravitational potential energy
An object has gravitational potential energy due to its
A. momentum
B. speed
C. acceleration
D. location. - ANSWER-D
Relative to an initial height, an object raised twice as high has gravitational potential
energy that is
A. 1/4 as much
B. half as much
C. the same.
D. twice as much
