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Universal Law of Gravitation

A satellite r...

Question

A satellite revolves around the earth in a circular orbit. What is the work done by gravity on the satellite? Give reason.

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Solution

The force is acting radially inwards while the displacement is tangential. So the angle between force and displacement is $90^{\circ}$ .
Now, $W = F s c o s θ$
$= F s c o s 90^{\circ}$
$= 0$

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