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Homework Help: Determine total mechanical energy

  1. Oct 21, 2013 #1
    1. The problem statement, all variables and given/known data
    What's the total mechanical energy of a 400kg satellite in circular orbit 1100km above Earth's surface?

    2. Relevant equations

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

    kinetic energy k=1/2mv^2

    3. 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...
  2. jcsd
  3. Oct 21, 2013 #2

    rude man

    User Avatar
    Homework Helper
    Gold Member

    Equate centripetal force to gravitational force.

    Assume Earth mass >> satellite mass.
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