Question

How much the work is done when the earth moves around the sun in its orbit.

Answer 1

1. The formula for work done = $Fs\cos \theta$ where $F$ is the force, $s$ is displacement, and $\theta$is the angle between the direction of force and displacement.
2. Here, the angle between the direction of force and displacement or direction of motion of Earth is ${90}^{°}$.
3. If $\theta$ is ${90}^{°}$, then the value of $\cos {90}^{°}$would be zero, making the whole work done to be zero.
4. So, in the motion of Earth around the Sun, no work is done.