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Question about satellite motion?

  1. Nov 18, 2014 #1
    • Homework template not used; Member warned.
    This is one of the questions in the book without an answer and it is really frustrating that I can't check if my through process is correct.

    Two satellites X and Y are seen from the ground crossing the night sky at the same time. Satellite X crosses the sky faster than Y. State with a reason which satellite is higher.

    I wrote: Satellite Y as the gravitational attraction doesn't act as much on it so it moves around the earth slower than X does.

    Is my answer correct?
     
  2. jcsd
  3. Nov 18, 2014 #2

    haruspex

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    Half right. Can you write down an equation for the force and resulting acceleration of a satellite at radius R?
     
  4. Nov 18, 2014 #3
    a= v^2/r and F = mv^2/r , where r is the distance from centre of the earth to the satellite. Where do I go from here?
     
  5. Nov 19, 2014 #4

    haruspex

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    Since it is in orbit, what else is F equal to?
     
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