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Homework Help: Two quick orbit orbit qs!

  1. May 4, 2010 #1


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    1. The problem statement, all variables and given/known data

    1) A satellite is in circular orbit around the sun. Which requires the greater change in satellite's speed: to escape the solar system or fall into the sun?

    2)Why does atmospheric friction increase the speed of a satellite in low earth orbit?

    2. Relevant equations

    3. The attempt at a solution

    1) Not sure..Surely the change in speed in 2 cases would be the same?

    2) Again ..not sure.. :S
  2. jcsd
  3. May 4, 2010 #2


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    hi bon! :smile:
    (if the Sun has mass M and if the orbit has radius r …)

    What initial speed is needed to escape to infinity?

    What initial speed is needed to reach the Sun?
    It stays in orbit: but what happens to the orbit?
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