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Mars Problem

  1. Apr 29, 2015 #1
    1. The problem statement, all variables and given/known data
    On Mars, a martian tells you he has 35.0kg of mass. What is his weight on mars?

    Mars Info:
    Mass= 6.42x10^23
    Radius= 3.40x10^6
    Radius of Orbit about sun= 2.30x10^11

    2. Relevant equations
    FG=GM1M2/R^2

    3. The attempt at a solution
    I tried using the equation above, but i got 4.28x10^13. Im pretty sure you have to find Gravity on mars and multiply it with the martians mass because mass to weight on earth is mass(kg) x 9.8 m/s^2 (Gravity on Earth)


    (Hopefully this is a better format than my last thread.
     
  2. jcsd
  3. Apr 29, 2015 #2
    Btw, please show how you got the answer.
     
  4. Apr 29, 2015 #3

    haruspex

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    it sounds like you forgot to multiply by G.. please post all working.
     
  5. Apr 29, 2015 #4
    That's the problem. How do you find G on Mars???
     
  6. Apr 29, 2015 #5

    haruspex

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    G is a universal constant (not to be confused with g).
     
  7. Apr 30, 2015 #6
    If you have a data sheet, the gravitational field strengths for various planets may be given. This would allow you to use W=mg.
     
  8. Apr 30, 2015 #7

    haruspex

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    I'm sure AmericanBoy is supposed to use the information about Mars provided.
     
  9. Apr 30, 2015 #8
    How would information like this help the OP who is trying to learn the fundamentals?

    Chet
     
  10. Apr 30, 2015 #9
    It looks like you have the correct formula, you just plug everything in to get the final answer. (6.67 x 10^-11N·(m/kg)^2)(35kg)(6.42 x 10^23kg) / (3.4 x 10^6m)^2.
     
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