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Calculating satellites´ period of revolution

  1. Mar 13, 2009 #1
    1. The problem statement, all variables and given/known data
    Earths´ satellite orbits 4200km above Earths surface. Count satellites´ trajectory circle-shaped and calculate satellites´period of revolution.

    3. The attempt at a solution
    I added the Earths´ radius to the 4200 km, which represents the orbiting attitude and then my mind crashed...
    please some helpo:)
  2. jcsd
  3. Mar 13, 2009 #2


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    Homework Helper

    Welcome to PF.

    What is the acceleration of gravity at that height? (Hint: it's not 9.8)

    What other acceleration is there from circular motion?
  4. Mar 13, 2009 #3
    Of course the centripetal-acceleration but I thought that I should know the mass of the satellite to calculate the acceleration of gravity...

    btw.. thanks for the welcome
  5. Mar 13, 2009 #4


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    Homework Helper

    Since the 2 accelerations will need to offset to stay in orbit, you won't need the mass.
  6. Mar 13, 2009 #5
    yeah, that settles it down, I think I can see the big picture now,
    Thank You!
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