Which fact is represented by the pictures of an astronaut floating in a satellite?

The radii of circular orbits of two satellites $A$ and $B$ of the earth are $4R$ and $R$ respectively,where $R$ is the radius of the earth. If the speed of satellite $B$ is $6V$,then the speed of satellite $A$ will be:

Where can a geostationary satellite be installed?

Assertion $A$: An astronaut inside a massive spaceship orbiting around the Earth will experience a finite but small gravitational force.
Reason $R$: The centripetal force necessary to keep the spaceship in orbit around the Earth is provided by the gravitational force between the Earth and the spaceship.

The motion of planets in the solar system is governed by which of the following conservation laws?

The periodic time of a communication satellite is ......... $hours$.