A body weight 700 g on the surface of Earth. How much it weight on the surface of planet whose mass is`1/7 `and radius is half that of the Earth.

Explanation

Acceleration due to gravity g = `(GM)/(R^(2))`
`M_(e) = M/7 and R_(e) = R/2`
On the planet `g_(p). (G(M/7))/((R/2)^(2)) = 4/7 ((GM)/(R^(2))) = 4/7 g `
Hence weight on the planet `W_(p) = 700 xx 4/7`
`W_(p) = 400` gramm