If a satellite orbits as close to the earth's surface as possible,

$A$ 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 $\frac{R}{2}$,and the other mass moves in a circular orbit of radius $\frac{3R}{2}$. The difference between the final and initial total energies is

The magnitudes of the gravitational field at distances $r_1$ and $r_2$ from the centre of a uniform sphere of radius $R$ and mass $M$ are $F_1$ and $F_2$ respectively. Then-

Identify the correct option.

During the motion of a planet from perihelion to aphelion,the work done by the gravitational force of the sun on it is ...........

If the height of a satellite from the surface of the Earth is increased,then its