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Universal gravitation 2- determine the planet's orbital period

  1. Jun 23, 2012 #1
    1. The problem statement, all variables and given/known data

    A planet's mean distance from the sun is 2.00x10^11 m. Determine the planet's orbital period. Use information found in textbook.

    2. Relevant equations
    So I use the following equations:

    R=h+Rs

    T=2∏√(R3/GxMs)

    From the textbook I got the following values:

    Rs=6.96x108m
    ms=1.99x1030kg

    3. The attempt at a solution

    From the problem we also know that h=2x1011m

    So with that and the radius of the sun we are able to find the radius that will be used in the orbital period equation. R=(6.96x108m)+(2x1011m)=2.007x1011m

    with all these values we plug them into the orbital period equation and solve for T=49034131.61

    I don't know how to get the units for the period however... If someone could tell me if my calculations are correct and how I find these units that would be greatly appreciated! Thank you so much in advance for your time and help!
     
  2. jcsd
  3. Jun 23, 2012 #2

    HallsofIvy

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    Staff Emeritus
    Science Advisor

    Since you just wrote numerical values for "R", "Rs", h, and "Ms" without saying what any of those mean I don't see how anyone can determine what you are doing much less what the units should be.
     
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