An artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) energy E0.
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
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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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