Question

can someone check if i did this right? Question: Derive a formula for the mass of a planet in terms of its radius, r, the acceleration due to gravity at its surface, gp, and the gravitational constant, G.

Answer 1

this is my answer:
\[g _{p}= F _{grav}/ m =GM _{p}/r ^{2} ---> M _{p} = g _{p}r ^{2}/g\]

Answer 2

look's fine to me...

Answer 3

Mp=gp*r*r/G