Mass of a body is 40kg. Find the weight of body on the surface of a planet whose mass is double than the mass of the earth and radius is 4times the radius of earth.
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1600N (approximately)
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g' = GM' / R'^2
g' = G(2M) / (4R)^2
g' = GM / 8R^2
g' = g / 8
g' = 9.8 / 8
g' = 1.225 m/s^2
Weight of the body on planet is -
W = mg'
W = 40 × 1.225
W = 49 N
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