Question

the mass of a body is 40 kg . find the weight of the body on the surface of a planet whose mass is double the earth and radius is 4 times the earth​

Answer 1

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

Answer 2

I think

1600 N Becuase value of g=10(approx) if r=4times so g becomes 4times

Wt on earth will be 400N

On planet = 4 x 400 = 1600

Hope this helps u

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