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Homework Help: Classical mechanics orbital motion

  1. Nov 30, 2008 #1
    1. The mass of the sun is decreasing as dM/dt=-constant .M
    Find [dr/dt]/r for the earth

    2. Relevant equations

    3. I tried using M=M0-alpha. t and then separating the variables in the equation GMm/r^2=mdv/dt. I don't knot the right way to solve this. Plz tell me how to solve this problem and where can i find similar problems. I need your reply soon as i am preparing for qualifying exam.Thanx
  2. jcsd
  3. Dec 1, 2008 #2


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    Science Advisor
    Homework Helper

    We don't give solutions here.

    There are alot of physics problems books like "Schaum's Outline" etc.

    Now I would try the centripetal force.
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