객관식
How far would you have to be above Earth's surface for g to be ½ of its surface value?
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객관식
You stand on the surface of a mysterious planet with a mass of 6 ×1024 kg and measure the surface gravity to be 7 m/s2. What must the radius of the planet be?
A
5.72×1013m
B
4.43×1014m
C
8.17×1012m
D
7.56×106m
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