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Explaining Central Force of inverse r^3

  1. Sep 20, 2012 #1
    1. The problem statement, all variables and given/known data

    Consider the central force F=-k/(r^3) u(hat in r direction). This is an attractive force. For various values of k, explain what the orbit of a particle about a force center looks like.

    2. Relevant equations

    Included within question.

    3. The attempt at a solution

    I am not quite sure where to begin. I know this is like modelling the tidal force separate of gravitation, or I think so. Looking for a starting point if anyone can help. (This is for a classical dynamics course.)
     
  2. jcsd
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