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Homework Help: Tb / Ta = ?

  1. Mar 9, 2005 #1
    Tb / Ta = ??????

    i have a final question, which is how do i find this. i know what the question is askin i just dont understand how to get the answer

    Two planets A and B, where B has twice the
    mass of A, orbit the Sun in elliptical orbits.
    The semi-major axis of the elliptical orbit of
    planet B is two times larger than the semi-
    major axis of the elliptical orbit of planet A.
    What is the ratio of the orbital period of
    planet B to that of planet A?
     
  2. jcsd
  3. Mar 9, 2005 #2

    dextercioby

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    HINT:Apply the 3-rd law of Kepler...

    Daniel.
     
  4. Mar 9, 2005 #3

    James R

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    What is the equation which relates the semi-major axis of an orbit to the orbital period?
     
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