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Astronomy
Chapter 5
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Question 1
If your mass on Earth is 100 kg, what is your mass on the
Moon?
A. 100 kg
B. 10 slugs
C. 60 lb
D. 60 kg
E. 60 N
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Question 2
What would happen if a spacecraft was launched with a
speed greater than the Earth's escape velocity?
A. It would travel into a higher orbit around the Earth.
B. It would plunge back into Earth and re-enter the
atmosphere.
C. It would orbit the Earth at a faster velocity.
D. It would travel away from the Earth into the Solar
System.
E. It would be an unstable orbit.
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Question 3
Suppose an object is moving in a straight line at 50 km/hr.
According to Newton's Law of Motion, the object will
A. continue to move at the same velocity regardless of
what happens.
B. continue to move at the same velocity until acted upon
by an outside force.
C. slow down to a stop.
D. for any force, there always is an equal and opposite
reaction force.
E. speed up to the speed of light.
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Question 4
Newton's Second Law of Motion states that the net force
applied to an object (with constant mass) is proportional
to its
A. acceleration.
B. momentum.
C. velocity.
D. position.
E. energy.
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Question 5
According to Newton's Universal Law of Gravitation, if you
triple the distance between two masses, then the
gravitational force between them will be
A. increased by a factor of 2.
B. decreased by a factor of 9.
C. decreased by a factor of 4.
D. increased by a factor of 4.
E. decreased by a factor of 6.
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Question 6
Acceleration is defined as
A. displacement divided by time.
B. how fast an object moves.
C. the rate of change of distance with respect to time.
D. speed divided by time squared.
E. the speeding up or slowing down of an object (changing
velocities).
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Question 7
A __________________ satellite has a orbital period of 24
hours, which is also the rotation period of the Earth. In
this way, a satellite of this type would appear to stay over
the same location of the Earth's surface.
A. solar orbit
B. translunar injection orbit
C. geosynchronous
D. low orbit
E. hyperbolic
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Question 8
While on the Moon, astronaut Dave Scott demonstrated Galileo's
experiment by dropping a feather and a hammer. They reached the
surface at the same time because
A. the force of gravity is larger on the feather than on the hammer.
B. the gravitational acceleration of each object is the same.
C. the force of gravity has no effect on either object.
D. the velocity of the feather is greater than the hammer.
E. the force of gravity varies as the square of the distance of the feather
to the surface.
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Question 9
Newton's Second Law of Motion describes the concept of
inertia.
A. True
B. False
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Question 10
The escape velocity of Jupiter is smaller than that on Earth.
A. True
B. False
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Question 11
A force is a push or a pull that is a vector quantity
(magnitude and direction).
A. True
B. False
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Question 12
Kinetic energy of an object depends on its mass and
velocity.
A. True
B. False
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Question 13
In simple language, Kepler's Second Law means
A. the period of planets closer to the sun are longer than
those farther away.
B. a planet moves more slowly when near the Sun than
farther away.
C. the Sun is at the center of planetary orbits.
D. a planet moves more rapidly when near the Sun than
when farther away.
E. planets move in elliptical with the Sun at one foci.
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Question 14
Take three identical bricks; strap two of them together and drop them
from the same height. Which statement is true?
A. The combined bricks will fall twice as fast as the single brick.
B. The combined bricks will fall four times as fast as the single brick.
C. The gravitational force between the Earth and the combined bricks is
twice as strong as the gravitational force between the Earth and the
single brick.
D. The gravitational force between the Earth and the combined bricks is
the same as the gravitational force between the Earth and the single
brick.
E. The gravitational force between the Earth and the combined bricks is
one-half the gravitational force between the Earth and the single
brick.
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Question 15
A hockey puck is seen moving north over a frozen pond at
a speed of 2m/sec. A while later it is seen moving west at
2m/sec. Which of the following correctly describes the
forces acting on the puck?
A. A force has acted, since the direction has changed.
B. No force has acted, since the speed is the same.
C. A force has acted, but only in a northward direction.
D. The above information is insufficient to tell if forces have
acted.
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Question 16
Suppose an astronaut whose mass is 50 kg pushes herself
away from an artificial satellite which has a mass of 500
kg. While she is pushing, the acceleration of the satellite
is 1 m/s per second. What is the acceleration of the
astronaut?
A. 1 m/s per second
B. 10 m/s per second
C. 1/10 m/s per second
D. 100 m/s per second
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Question 17
If the diameter of the Earth were suddenly reduced to onefourth of its present size while its mass remained the
same, how would your weight be altered?
A. It would become 4 times as great.
B. It would become 16 times as great.
C. It would become 8 times as great.
D. It would remain unchanged.
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1. A
5. B
9. B
13. D
17. B
2. D
6. E
10. B
14. C
3. B
4. A
7. C
8. B
11. A12. A
15. A
16. B
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