Physicshard · Past Paper
If the mass of a planet is 4 times Earth and its radius is 2 times Earth, 'g' on that planet is:
ASame as Earth
BDouble of Earth
CHalf of Earth
DFour times Earth
✓ Correct Answer: A — Same as Earth
g' = G(4M)/(2R)² = 4GM/4R² = GM/R² = g.
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