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helpmymaths
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Homework Statement
How much energy per unit mass (E/m) must you give a rocket to put it into a geosynchronous orbit three Earth radii above the surface of the Earth?
Radius of Earth : 6380 km
GM/r = 6.25 x 10^7 m^2/ s^2
Homework Equations
U(r) = - GMm/r
The Attempt at a Solution
I am not really sure where to start with this one. I think it should be at equilibrium 3radii up.
1/2mv^2 = Gm/r ??