If a satellite's radial velocity is zero at all times, its orbit must be
A)parabolic.
B)elliptical.
C)circular.
D)geosynchronous.

Question

Quizplus · Accepted Answer

If a satellite has zero radial velocity at all times, it means that it is moving perpendicular to the gravitational force acting on it. In order for a satellite to move perpendicular to the gravitational force, the force must be constantly changing the direction of the satellite's velocity vector. This can only happen if the satellite is moving in a circular orbit, where the gravitational force is always perpendicular to the velocity vector. Therefore, the best choice is a circular orbit.

If a Satellite's Radial Velocity Is Zero at All Times