Question

A 10 kg satellite completes one revolution around the earth at a height of 100 km. In 108 minutes. What is the work done by the gravitational force of the earth?

Answer 1

Listing out the Formula

Work Done = Force x Displacement

Force = Mass x Acceleration

Considering the displacement of this Sattelite

One complete circle = Displacement = 0

∴ Work Done by Gravity is Zero

Hope it helps

Answer 2

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.

In this case the mass, distance and time do not affect the work done.

Hope this helps.