A body is moving in a low circular orbit about a planet of mass M and radius R. The radius of the orbit can be taken to be R itself. Then the ratio of the speed of this body in the orbit to the escape velocity from the planet is :

A satellite is in a circular orbit around a planet . Its period of revolution is T, radius of the orbit is R, orbital velocity V and acceleration .a. , then

Ratio of the radius of a planet A to that of planet B is r . The ratio of acceleration due to gravity for the two planets is x . The ratio of the escape velocities from the two planets is

If v_(e) is the escape velocity of a body from a planet of mass 'M' and radius 'R . Then the velocity of the satellite revolving at height 'h' from the surface of the planet will be

A body of mass m is moving in a circular orbit of radius R about a planet of mass M. At some instant, it splits into two equal masses. The first mass moves in a circular orbit of radius R/2 . And the other mass, in a circular orbit of radius (3R)/(2) . The difference between the final and initial total energies is :