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Homework Help: Find gravitation on Mard and the Earth

  1. Nov 10, 2008 #1
    1. The problem statement, all variables and given/known data
    Mars Data:
    Radius = .53 * Earth's Radius
    Mass = .11 * Earth's Mass

    Find the acceleration due to gravity on Mars in terms of g, the acceleration due to gravity on Earth.

    2. Relevant equations
    g=Gm / r2

    3. The attempt at a solution
    gm= G(.11 ME) / .53rE2

    gE = GmE / rE2
    9.8 m/s2= GmE / rE2


    gM=[G(.11 ME) / r2] / [GmE / rE2] * 9.8

    gM= .11/.53 * 9.8

    gM=2.034 m/s2

    I'm not sure if this is right though.
  2. jcsd
  3. Nov 10, 2008 #2


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    Science Advisor
    Homework Helper

    Hi DollarBill! :smile:
    Do you mean that, or have you written it wrong?
  4. Nov 10, 2008 #3
    Re: Gravitation

    Forgot the parenthesis...
    gM= G(.11 ME) / (.53 rE)2.
  5. Nov 10, 2008 #4
    Re: Gravitation

    Ok now I see what I did. Forgot to square the .53 :blushing:

    gM=3.8 m/s2
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