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Satellite pedigree/apogee ratio. 2 values given both __Earth radii

  1. Jun 27, 2010 #1
    A satellite is placed in a noncircular orbit about the Earth. The farthest point of its orbit (apogee) is 3.6 Earth radii from the center of the Earth, while its nearest point (perigee) is 2.7 Earth radii from the Earth's center. If we define the gravitational potential energy U to be zero for an infinite separation of Earth and satellite, find the ratio

    Upedigree
    Uapogee
    .


    I tried 3.6 Earth radii / 2.7 Earth radii and put 1.3 as the ratio. Then i tried the other way around with 2.7 / 3.6. I looked in my textbook and there is no explanation for this type of problem. I know the equation for gravitational potential energy ( U = (G m1 m2) / r

    but I don't have either mass.


    Bobby
     
  2. jcsd
  3. Jun 28, 2010 #2

    Filip Larsen

    User Avatar
    Gold Member

    Try write up the division anyway using the unknown masses and see what happens.

    And please make your spell checker stop replacing perigee with pedigree :)
     
  4. Jun 28, 2010 #3
    The other way round

    but this is not even a level question
     
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