N/A — Exam Answers

Which free body diagram shows the forces acting on block A?

A

Image with description A free body diagram with three force vectors, the first pointing downward labeled F Subscript g A Baseline, the second pointing upward labeled F Subscript T 1 Baseline, and the third pointing upward labeled F Subscript T 2.

B

Image with description A free body diagram with three force vectors, the first pointing downward labeled F Subscript g A Baseline, the second pointing upward labeled F Subscript T 1 Baseline, and the third pointing downward labeled F Subscript T 2.

C

Image with description A free body diagram with three force vectors, the first pointing downward labeled F Subscript g A Baseline, the second pointing upward labeled F Subscript T 1 Baseline, and the third pointing downward labeled F Subscript g B.

D

Image with description A free body diagram with two force vectors, the first pointing downward labeled F Subscript g A Baseline, the second pointing upward labeled F Subscript T 1 Baseline.

2

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Which lists the springs based on the amount of elastic potential energy, from greatest to least?

A

X, W, Y, Z

B

X, Y, W, Z

C

Z, W, Y, X

D

Z, Y, W, X

3

Which label belongs in the area marked X?

A

Includes magnitude

B

Is always constant

C

Has direction

D

Depends on a reference frame

4

Which statement relates most directly to the second law?

A

1

B

2

C

3

D

4

5

Which trial shows the conservation of momentum in a closed system?

A

Trial 1

B

Trial 2

C

Trial 3

D

Trial 4

6

Which energy transformation is correct?

A

From D to E, gravitational potential energy is transformed into kinetic energy.

B

From A to C, kinetic energy is transformed into gravitational potential energy.

C

From C to D, kinetic energy is transformed into gravitational potential energy.

D

From C to E, gravitational potential energy is transformed into kinetic energy.

7

What is the magnitude of the resultant vector?

A

169 miles

B

17 miles

C

60 miles

D

13 miles

8

If the goal of the turbine is to put out electric energy, what is the efficiency of the turbine?

A

100 percent

B

75 percent

C

25 percent

D

50 percent

9

Which describes what happens to the bone?

A

It begins to move toward the right.

B

It stays in dynamic equilibrium.

C

It stays in static equilibrium.

D

It begins to move toward the left.

10

An advertising agency writes marketing material for a new motor (Brand W) that has a power rating of 7,640 W. Which statement comparing the motors can they truthfully use?

A

Brand W motor can finish any job faster than Brand Y motor can.

B

There’s not a more powerful motor available.

C

Every second, Brand W motor does 7,640 N of your toughest work.

D

Brand W motor does more work each second than Brand X or Brand Z.

11

Which arrow represents the centripetal force responsible for this motion?

A

W

B

X

C

Y

D

Z

12

Which labels best complete the diagram?

A

X: Work is done by the system and temperature decreases. Y: Work is done to the system and temperature increases.

B

X: Work is done by the system and temperature increases. Y: Work is done to the system and temperature decreases.

C

X: Work is done to the system and temperature increases. Y: Work is done by the system and temperature decreases.

D

X: Work is done to the system and temperature decreases. Y: Work is done by the system and temperature increases.

13

How much electrical energy is involved in this transformation?

A

60 J

B

120 J

C

100 J

D

80 J

14

Which label belongs in the region marked X?

A

Is slowing down and coming to rest

B

Has a net force of zero

C

Is moving with a constant velocity

D

Has a velocity of zero

15

Which best describes the acceleration of the object?

A

changing and negative

B

changing and positive

C

constant and positive

D

constant and negative

16

A train travels 600 kilometers in 4 hours. What is the speed of the train?

A

150 kilometers per hour

B

604 kilometers per hour

C

0.007 kilometers per hour

D

2 comma 400 kilometers per hour

17

Which best describes the heat that you can feel on the engine of a running car?

A

The heat is unusable and absorbed by the engine.

B

The heat is unusable and lost to the surroundings.

C

The heat is usable and lost to the surroundings.

D

The heat is usable and absorbed by the engine.

18

If all else stays the same, which change could be made to cause an increase in the gravitational force on a space shuttle?

A

decreasing the universal gravitational constant acting on the space shuttle

B

increasing the universal gravitational constant acting on the space shuttle

C

increasing the distance of the space shuttle from Earth

D

decreasing the distance of the space shuttle from Earth

19

A car with a mass of 1 comma 500 kilograms requires a centripetal force of 640 cap n to safely follow a circular curve in the road at 13 point 4 m/s What is the radius of the curve?

A

77 m

B

31 m

C

860 m

D

421 m

20

A twirler’s baton is 0 point 7 6 m long and spins around its center. The end of the baton has a centripetal acceleration of 47 point 8 m/s squared How long does it take the baton to complete one spin?

A

0 point 3 1 s

B

4 point 3 s

C

0 point 5 6 s

D

70 s

N/A — Exam Answers

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