How much work is done by the gravitational field in moving a mass m of 20 kg from infinity to a point a, 0.40m from a mass m of 30 kg?
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Answer:
Work done by gravitational force
W = - ΔU
W = - (-GmM)/r = GmM/r
M = 30kg,
m = 20kg
r = 0.40m
W = (20*30*6.67*10^-11)/0.40
~ 10^-6 J = 1 microjoule
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