The radius of planet is R1 and a satellite revolves round it in a circle of radius R2. The time period of revolution is T. Find the acceleration due to the gravitation of the planet at its surface.

The radius of planet is R1 and that of the orbit of satellite is R2. The time period of revolution is given by


Rearranging the equation,



Dividing by on both sides



Acceleration due to gravity is given by



1