Determine total mechanical energy

  • Thread starter nickb145
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  • #1
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Homework Statement


What's the total mechanical energy of a 400kg satellite in circular orbit 1100km above Earth's surface?


Homework Equations



The Gravitational potential energy U=-(Gm1m2)/r

kinetic energy k=1/2mv^2


The Attempt at a Solution



At first i thought i could do just the gravitational potential energy, then figured out i was missing the kinetic energy. But one problem, i can't remember how to find the velocity

Would it have anything with angular velocity with it?

So i have the gravitional potential energy, just not the kinetic enegry...
 

Answers and Replies

  • #2
rude man
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Equate centripetal force to gravitational force.

Assume Earth mass >> satellite mass.
 

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