PHY 102-Exam #2 | Latest study | Actual Questions
and Answers | 2026 Updates | 100% correct
Which of the following is a unit of work?
J*s
W
N*m
N/s - ANSWER-N*m
What is the SI unit of energy? - ANSWER-joule
Which of the following objects has the greatest kinetic energy?
an object with a mass of 4m and a velocity of v
an object with a mass of 3m and a velocity of 2v
an object with a mass of 2m and a velocity of 3v
an object with a mass of m and a velocity of 4v - ANSWER-an object with a mass of 2m and a
velocity of 3v
When negative work is done on a moving object, its kinetic energy
increases
decreases
remains constant - ANSWER-decreases
On which of the following does the speed of a falling object depend?
parallel distance
√∆h
, mass
1/2mv^2 - ANSWER-√∆h
Power is expresses by which of the following units
W/m
N·m
W·s
J/s - ANSWER-J/s
If one motor has three times as much power as another, then the less powerful motor
can do the same work in three times the time.
can do the same work in the same time.
can never do the same work as the larger motor.
can do the same work in one-third the time. - ANSWER-can do the same work in three times the
time.
How much work is required to lift a bucket of water from a well?
Work is equal to the mass of the bucket of water times the depth of the well, W = mh.
Work is equal to the weight of the person lifting the bucket, W = Mpersong, regardless of the
height of the well.
Work is equal to the weight of the bucket of water, W = mg, regardless of the height of the well.
Work is equal to the weight of the bucket of water times the depth of the well, W = mgh.
Work is equal to the weight of the person lifting the bucket times the depth of the well, W =
Mpersongh. - ANSWER-Work is equal to the weight of the bucket of water times the depth of
the well, W = mgh
If the speed of a moving object is doubled, how many times more work is required to bring it to
rest?
and Answers | 2026 Updates | 100% correct
Which of the following is a unit of work?
J*s
W
N*m
N/s - ANSWER-N*m
What is the SI unit of energy? - ANSWER-joule
Which of the following objects has the greatest kinetic energy?
an object with a mass of 4m and a velocity of v
an object with a mass of 3m and a velocity of 2v
an object with a mass of 2m and a velocity of 3v
an object with a mass of m and a velocity of 4v - ANSWER-an object with a mass of 2m and a
velocity of 3v
When negative work is done on a moving object, its kinetic energy
increases
decreases
remains constant - ANSWER-decreases
On which of the following does the speed of a falling object depend?
parallel distance
√∆h
, mass
1/2mv^2 - ANSWER-√∆h
Power is expresses by which of the following units
W/m
N·m
W·s
J/s - ANSWER-J/s
If one motor has three times as much power as another, then the less powerful motor
can do the same work in three times the time.
can do the same work in the same time.
can never do the same work as the larger motor.
can do the same work in one-third the time. - ANSWER-can do the same work in three times the
time.
How much work is required to lift a bucket of water from a well?
Work is equal to the mass of the bucket of water times the depth of the well, W = mh.
Work is equal to the weight of the person lifting the bucket, W = Mpersong, regardless of the
height of the well.
Work is equal to the weight of the bucket of water, W = mg, regardless of the height of the well.
Work is equal to the weight of the bucket of water times the depth of the well, W = mgh.
Work is equal to the weight of the person lifting the bucket times the depth of the well, W =
Mpersongh. - ANSWER-Work is equal to the weight of the bucket of water times the depth of
the well, W = mgh
If the speed of a moving object is doubled, how many times more work is required to bring it to
rest?
