The Moon revolves around the Earth $13$ times per year. If the ratio of distance of Earth from Sun to distance of Moon from Earth is $392$. Find the ratio of mass of Sun to mass of Earth approximately.

An artificial satellite is moving in a circular orbit around the earth with a speed equal to half the magnitude of escape velocity from earth. Show that the height of the satellite above earth surface is $2\mathrm{R}$.

Gravitational force acts between two $60 \mathrm{kg}$ men $1$ metre apart on earth is (N$\times {10}^{-7}$ )Newton.

What is the value of N ?

$\left[\mathrm{Given} : \mathrm{G}=6.67\times {10}^{-11} {\mathrm{Nm}}^2{\mathrm{kg}}^{-2}\right]$