Question

b. The radius of planet A is half the
radius of planet B. If the mass of A is
M, what must be the mass of B so
that the value of g on B is half that of
its value on A?
Ans: 2 M​

Answer 1

Explanation:

let g value on a is g1 and g value on b is g2

g1 = 2g2 is given and r1 = r/2 and r2 = r

then Gm/(r/2^2 ) = 2 G x /r^2

then on solving above equation

mass of b (x) will occure= 2m