Question

a satellite with mass m moves around the earth having radius R it completes half its rotation what is the work done ???????????

Answer 1

Hello
As the satellite moves around the earth in a circular path thus it will be tangential at every point on its path to the core of the earth.
Thus the satellite will be perpendicular to the earth at every point.
Thus,
Work done = Force * d * cos theta
But here the value of theta is 90.
Thus
Work = Force * displacement * cos 90.
But the value of cos 90 is 0.
Thus the work done throughout Will be 0 J.