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Homework Help: Find the maxima and minima of the magnitude

  1. Mar 26, 2007 #1
    1. The problem statement, all variables and given/known data

    A hypothetical star S has a planet P that moves in an elliptical orbit with period T . The minimum distance of P from S is d and the maximum distance is 1.7d.
    (i) find the maxima and minima of the magnitude of the acceleration of P, in terms of d and T .

    2. Relevant equations

    dont know

    3. The attempt at a solution

    can anyone give me the eqution for this
  2. jcsd
  3. Mar 27, 2007 #2


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    Try Newton´s law of gravitation or Kepler´s laws.
  4. Apr 10, 2007 #3
    a= (2*pi)^2 * ( r^3 / T^2) * 1/ X^2

    minimum distance is d
    max distance is 1.7 d

    do i substitue d for r?
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