Question

If a satellite is revolving around the earth in a circular orbit in a plane containing earth's axis of rotation. if the angular speed of satellite is equal to that of earth, find the time it takes to move from a point above north pole of a point above the equator.

Answer 1

A satellite which rotates with angular speed equal to earth's rotation has an orbit radius 7 R_e and the angular speed of revolution is

When satellite moves from a point above north pole to a point above equator, it traverses an angle π/2, this time taken is