Efficiency η = useful work output / total work input = useful power output / total power input, since power = work/time. Both definitions are equivalent for steady operation. Efficiency is always < 1 (or
Explanation:
g = GM/R², where M is mass of Earth, R radius, G universal constant. It does not depend on mass of falling object (Galileo's experiment). Earth's rotation causes slight variation but surface g is primarily determined by M and R. So mass of Earth is factor.
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