Multiple Choice
Identify the choice that best completes the
statement or answers the question.
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1.
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The orbital speed for a satellite orbiting very close to Earth's surface is
_____.
a. | 1600 m/s | b. | 4900 m/s | c. | 8000
m/s | d. | 16,000 m/s | e. | 80,000 m/s |
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2.
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The reason satellites orbit Earth at least 150 km above the surface is to
_____.
a. | be above Earth's gravity | b. | make sure they are higher than the highest
mountains | c. | be above Earth's atmosphere | d. | keep them out of the way of commercial
airliners. | e. | all of the above |
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3.
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The speed of a satellite in a circular orbit is _____.
a. | constant | b. | not constant | c. | constantly
increasing |
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4.
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The speed of a satellite in an elliptical orbit is _____.
a. | independent of the height of the satellite | b. | not
constant | c. | constant |
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5.
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A period of a satellite is defined as _____.
a. | the time for a satellite to cross the United States | b. | 1
second | c. | the time for a satellite to make one complete revolution around
Earth | d. | 90 seconds | e. | 24 hours |
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6.
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The higher a satellite is, the _____.
a. | less its speed is | b. | greater its speed is | c. | longer its period
is | d. | both A and C | e. | both B and C |
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7.
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The fastest moving planet in a solar system is _____.
a. | the most massive planet | b. | any planet (they all move at the same
speed) | c. | the smallest planet | d. | the planet nearest the
sun |
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8.
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An object is placed exactly halfway between Earth and the moon. The object will
fall toward _____.
a. | the moon | b. | Earth | c. | neither Earth nor
the moon |
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9.
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Compared to the period of a satellite in orbit close to Earth, the period of a
satellite in orbit far from Earth is _____.
a. | the same | b. | longer | c. | shorter | d. | Not enough
information |
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10.
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Where does a satellite in an elliptical orbit have the greatest kinetic
energy?
a. | At the point closest to the planet | b. | Exactly at the point halfway to the
planet | c. | At the point farthest from the planet | d. | Anywhere -- its kinetic energy is
constant | e. | More information is needed |
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11.
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Where does a satellite in a circular orbit have the greatest kinetic
energy?
a. | At the point farthest from the planet | b. | Exactly at the point halfway to the
planet | c. | At the point closest to the planet | d. | Anywhere—its kinetic energy is
constant | e. | More information is needed |
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12.
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What remains constant for a satellite in an elliptical orbit?
a. | Its speed | b. | Its potential energy | c. | Its total
energy | d. | Its kinetic energy | e. | Its distance from the
planet |
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13.
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Minimal orbital speed about Earth is approximately 8 km/s. Minimal orbital speed
about the moon would be _____.
a. | less than 8 km/s | b. | about 8 km/s | c. | more than 8
km/s |
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14.
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As a satellite is moving in orbit around the Earth, the sum of the kinetic
energy and potential energy everywhere is _______ .
a. | decreasing. | c. | constant. | b. | increasing. | d. | zero. |
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15.
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Which of the following describes how circular and elliptical satellite orbits
vary?
a. | In a circular orbit, both the distance to Earth and the speed of the satellite vary.
In an elliptical orbit, neither the distance to Earth nor the speed of the satellite
vary. | b. | In a circular orbit, neither the distance to Earth nor the speed of the satellite
vary. In an elliptical orbit, both the distance to Earth and the speed of the satellite
vary. | c. | In both a circular orbit and an elliptical orbit, both the distance to Earth and the
speed of the satellite vary. | d. | In both a circular orbit and an elliptical
orbit, neither the distance to Earth nor the speed of the satellite
vary. |
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