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Homework Help: Orbit Problem

  1. Nov 17, 2009 #1
    1. The problem statement, all variables and given/known data

    Two moons orbit a planet in nearly circular orbits. Moon A has orbital radius r, and moon B has orbital radius 5r. Moon A takes 50 days to complete one orbit. How long does it take moon B to complete and orbit?

    2. Relevant equations

    Kepler's Third Law

    3. The attempt at a solution

    I know we're supposed to attempt it, but I'm not even sure I'm heading in the right direction! Can anybody give me some insight?
  2. jcsd
  3. Nov 17, 2009 #2


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    Science Advisor
    Homework Helper

    have you tried looking up kepler's 3rd law /
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