(adsbygoogle = window.adsbygoogle || []).push({}); [SOLVED] energy for circular orbit

This one should be easy for you guys, I've been workin on it for a while and need pointed in the right direction. For starters, here's the question:

Neglecting Earth's rotation, show that the energy needed to launch a satellite of mass m into circular orbit at altitude h is [(GMm)/R]*[(R+2h)/(2*(R+h))]

where G is 6.67x10^-11, M=mass of the earth, R=radius of the earth

I believe the problem has to do with conservation of energy, so I found the change in potential energy between the surface of the earth and height h. I think I need to find the change in kinetic energy from the surface and height h then add U and K to find the total energy. I did this and came up with an incorrect answer. Where am I going wrong?

P.S. nice site!

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# Homework Help: Energy for circular orbit

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