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The earth moving around the sun in a cir...

The earth moving around the sun in a circular orbit is acted upon by a force and hence work must be done on the earth. Do you agree with this statement?

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The statement is wrong. The earth revolves around the sun under the force of attraction of the sun. This force (centripetal) is always perpendicular to the motion of the earth. Therefore, `theta=90^(@)` and `W=FS cos 90^(@)=0`. Hence, sun does to work on the earth.
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