Question

Calculate the work done by gravity when Satellite is moving around the Earth in circular orbit if radius 36000 Km?​

Answer 1

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Answer 2

Given:

Radius of circular orbit = 36000 km

To find:

Work done by gravity on the satellite.

Solution:

We know that Work done = Force*Displacement* cosθ

• Here force is the gravitational force acting on the satellite,

• Displacement is along the circular orbit,

• θ is the angle between force and displacement vector.

Since force acts in the perpendicular direction (towards the center of the earth) from the displacement vector (along the circular orbit)

Therefore cos θ = cos 90° = 0

Work done = 0

Therefore work done by gravity on the satellite will be 0.