1.

An artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) energy E0. Its potential energy is(a) –E0 (b) 15E0 (c) 2E0 (d) E0

Answer»

Correct Option (c) 2E0 

Explanation :

For a satellite, we have

Kinetic energy = GmM/2r

Potential energy = -GmM/r

Total energy E0 = KE + PE

= GmMr/2r - GmM/r = GmM/2r = PE/2

or PE = 2E0



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