Question

Two satellites are revolving in the same circular orbit round the centre of the earth. They must have the same :

• A. Mass
• B. Angular momentum
• C. Kinetic energy
• D. Magnitude of velocity

Answer 1

The correct option is D

Magnitude of velocity

For a satellite to revolve in circular orbit,
its orbital velocity
$v_o=\sqrt{gr}$
$g$ is acceleration due to gravity of planet
$v_o$ depends only on $r$.
So, velocity can be same for both satellites.
Two satellites can have different mass.
As kinetic energy and angular momentum are dependent on mass,they are variable.