During the course of a single night, a planet that is moving in retrograde motion will move
A. east to west.
B. not at all.
C. west to east.
D. randomly about the sky.
Answer: A
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What is the gravitational force on a 70. kg person on the Earth, due to the moon? The mass of the moon is 7.36 × 1022 kg and the distance to the moon is 3.82 × 108 m
What will be an ideal response?
A wheel (radius = 0.20 m) is mounted on a frictionless, horizontal axis. A light cord wrapped around the wheel supports a 0.50-kg object, as shown in the figure. When released from rest the object falls with a downward acceleration of 5.0 m/s2. What is the rotational inertia of the wheel?
?
?
a.
0.023 kg?m2
b.
0.027 kg?m2
c.
0.016 kg?m2
d.
0.019 kg?m2
e.
0.032 kg?m2
Besides Earth, which terrestrial planet also has seasons?
A. Mercury B. Mars C. Venus D. Seasons are unique to Earth.
Escape velocity is the speed required to:
A) orbit an object. B) overcome the gravitational pull of an object. C) overtake an object in orbit and pass it. D) keep from falling out of orbit around an object. E) maintain a constant distance from an object.