Question

A body weighs 480n on earth. It is taken to a planet whose mass is half and the radius is double than that of the earth.How much will that body weigh on that planet

Answer 1

mg=480N

m=480/10=48kg

g'=G(M/2)/(2R)²

g'=G(M/2)/4R²

g'=GM/(2*4*R²)

g'=GM/8R²

g=GM/R²

g'=g/8

new weight

mg' = 48*g/8= 48*10/8=60N