Multiple Choice
Identify
the letter of the choice that best completes the statement or answers
the question.
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1. |
A
child pulls a 7.4-kg toboggan 4.2 m across level ground with a 15-N
force that is 34°
above the horizontal. The work done is
a. 35 J
b. 52 J c. 63 J d. 3.9 ´ 102 J e. 2.1 ´
103 J
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2. |
In
which situation is work not done?
a. a
frozen turkey is carried upstairs b. a frozen turkey
is carried on level ground c. a frozen turkey is dropped
d. a frozen turkey is carried downstairs e. a
frozen turkey is fired from a cannon
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3. |
When
an object doubles its speed, the kinetic energy increases by a factor
of
a. 1 b. 2 c. 4
d. 6 e. 8
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4. |
The
kinetic energy of a 24-kg dog running at 22 km/h is
a. 4.5
´
102 J b. 5.8 ´ 103 J c. 1.2 ´
104 J d. 2.6 ´ 102 J e. 73 J
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5. |
The
gravitational potential energy of a 3.4-g grasshopper 14 mm above the
ground is
a. 4.7 ´ 102 J b. 4.7 J
c. 0.47 J d. 4.7 ´ 10–2 J e. 4.7
´
10–4 J
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6. |
A
75-kg parachutist jumps from a plane at a height of 1.2 km. At the instant
he leaves the plane, his gravitational potential energy compared to
the plane is
a. 8.8
´
102 J b. –8.8 ´ 103 J c. 8.8 ´
105 J d. –8.8 ´ 105 J e. 0 J
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7. |
A
car slows down as it descends a hill. Which of the following is true?
a. the
gravitational potential energy decreases b. the kinetic
energy increases c. heat is produced by friction
d. two of A, B, and C are correct e. all of A,
B, and C are correct
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8. |
A
cyclist reaches the bottom of a hill with a speed of 18 m/s. Neglecting
air resistance and other friction, to what maximum height can they coast
up the hill without pedalling?
a. 17 m b. 18 m
c. 19 m d. 20 m e. 21 m
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9. |
A
1.30-kg pendulum bob is pulled to the side, raising it 19.0 cm above
its rest position. After it is released, the maximum speed will be
a. 0.616 m/s
b. 1.93 m/s c. 3.72 m/s d. 6.16
m/s e. 37.2 m/s
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10. |
In
the picture of a roller coaster track shown below, the point where the
roller coaster car would be travelling the fastest, under negligible
friction is
a. A b. B c. C
d. D e. E
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