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Gravitational force Question

  1. Feb 25, 2010 #1
    1. The problem statement, all variables and given/known data
    What is the approximate value of the gravitational force between a 61 kg astronaut and a 71000 kg space shuttle when they're 81 m apart?

    2. Relevant equations
    F = [G(Mm)/r^2]

    3. The attempt at a solution
    F = (6.67×10−11 N·m2/kg2)(61 kg)(71,000 kg)÷
    (84 m)2 = 48.4 nN.

    Web assign marked it wrong?
    Is it wrong?
  2. jcsd
  3. Feb 25, 2010 #2
    Check your arithmetic, given your set up (which is correct) I get 40.9 nN.
  4. Feb 25, 2010 #3
    ^ That is wrong.
  5. Feb 25, 2010 #4
    Whoops, I just checked what you had filled in the equation as. The problem you wrote says that the shuttle and the astronaut are 81 m apart, but the set-up shows 84 m. My bad.

    Using 81 m as the distance, I get 4.40 nN. Unless, of course, the problem actually is 84.
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