If the mass of Earth is 80 times of that of a planet and 'g' diameter is double that of planet and 'g' on the Earth is ` 9.8 ms^(-2)` Calculate te value of on that planet?

Explanation

Acceleration due to gravity `g = (GM)/(R^(2))`
`g_(p) = (GM_(P))/(R_(P)^(2)) and g_(e) = (GM_(e))/(R_(e)^(2))`
`(g_(p))/(g_(e )) = (GM_(P))/(R_(P)^(2)) xx (R_(e)^(2))/(GM_(e)) = (M_(P))/(M_(e)) ((R_(e))/(R_(P)))^(2)`
` g_(P) = g_(e) ((M_(P))/(M_(e))) ((R_(e))/(R_(p))) = 9.8 (1/80) (2)^(2) = 9.8 xx1/20 `
` g_(P) = 0.49 ms^(-2)`