Question

an artificial satellite is at height 36500 km above earth surface what is the work done by earth gravitational force in keepping it in iits orbit

Answer 1

The work done in this case is 0.
here, the direction of displacement is along the tangent while the direction of force is towards the center of the earth. Since, the direction of force in this case is perpendicular to the direction of displacement, the work done is 0.
Here the distance does not affect the work done.
Hope this helps.

Answer 2

Answer:

the gravitational force always act in perpendicular to the direction of motion of the satellite throughout the orbital motion of the satellite so the work done by Earth gravitational force in keeping the satellite in its orbit is equal to zero.