Question

What is the work done by the earth that is moving around the sun?

Answer 1

1. Work is said to be done when a force is applied to the body and displaces the body.
2. It is expressed as $W=Fs\cos \theta$ where F = force, s = displacement, and $\theta$ = angle between the force and the displacement.
3. As the earth is moving around the sun, the angle $\theta$ between them would be $90°$.
4. Value of $\cos 90°=0$.

Hence, the work done by the earth that is moving around the sun is $0$.