Question

When the earth is revolving around the Sun,
the gravitational work done by the Sun on
the earth for one complete revolution is
always:
Earth
Sun​

Answer 1

Explanation:

Work done by Earth

Both the forces centrifugal and the gravitational acting on the Earth is opposite to each other and equal in magnitude. So the Earth is stable in its orbit revolving around the Sun with a constant orbital velocity

Answer 2

Answer:

No gravitational work done by the sun on the earth moving in a perfect circle.

Explanation:

As we know that gravitational work done  $W= Force* displacement *cos\theta$

where $F$ = Force,  $S$ = displacement and  $\theta$ is the angle b/w $F$ and $S$

As we know the centripetal force is the reason that earth attracted towards the sun. So the direction of motion at every point is along the tangent to the orbit.

∵   $cos90^{o}=0$

Therefore $F* S*cos90^{o} =0$

Hence no gravitational work done during one revolution of earth around the sun.