The mass of a planet is one-tenth that of Earth and its diameter is half of Earth’s diameter. What is the acceleration due to gravity on that planet?
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The mass of a planet is one-tenth that of Earth and its diameter is half of Earth’s diameter. What is the acceleration due to gravity on that planet?

G1 Physics · Accepted Answer

Step 1: Surface gravity obeys g=GM/R². Step 2: With Mₚ=Mₑ/10 and Rₚ=Rₑ/2, gₚ/gₑ=(1/10)/(1/2)²=0.4; gₚ=0.4×9.8=3.92 m s⁻². Final answer: C — 3.92 m s⁻².