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Question

A satellite moves around the earth in a circular orbit of radius r with speed v. If the mass of the satellite is M, its total energy is
  1. Mv2
  2. 12Mv2
  3. 12Mv2
  4. 32Mv2


Solution

The correct option is C 12Mv2

=12Mv2GMeMr

But orbital speed v=GMer
GMer=v2

So, total energy = 12Mv2

 

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