Question

If the mass of a planet is 10% less than that of the
earth and the radius 20% greater than that of earth
acceleration due to gravity on the planet will be:​

Answer 1

Answer:

Gravity on the planet would be 0.625 times the gravity on Earth.

Explanation:

We know that acceleration due to gravity g = GM/r^2

Given the Mass of Planet $M_{p}$ = M - 10/100(M) = 0.9(M)

And Radius of Planet  $R_{p}$ = r + 20/100(r) = 1.2(r)

(where M and r are mass and radius of Earth respectively)

Plugging in the values in the above equation,

$g_{p}$ = G (0.9M)/(1.2r)^2

-> 0.625GM/r

-> $g_{p}$ = 0.625g