Physicshard · Past Paper
If the mass of a planet is 4 times Earth's mass and its radius is 2 times Earth's radius, what is 'g' on that planet?
Ag_earth
B2 g_earth
C0.5 g_earth
D4 g_earth
✓ Correct Answer: A — g_earth
g = GM/R^2. New g' = G(4M)/(2R)^2 = 4GM/4R^2 = GM/R^2 = g_earth.
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