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What is the minimum energy required to launch a satellite of mass m from the surface of a planet of mass M and radius R in a circular orbit at an altitude of 2R ? - physics 2013
(1) 5GmM/6R (2) 2GmM/3R (3) GmM/2R (4) GmM/3RBy:milan-ransinghTaged users:Likes:Be first to like this questionDislikes:Be first to dislike this question
Answers
Solution :
The kinetic energy at altitude 2R=GMm/6R
The gravitational potential energy at altitude 2R=−GMm/3R
Total energy =k∈+PE=−GMm/6R
Potential energy at the surface is −GMm/R
∴ Req. kinetic energy =GMm/R−GMm/6R
=5GMm/6R
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