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Gravitational force-help STUMPED

  1. Jun 18, 2007 #1
    1. The problem statement, all variables and given/known data

    A bowling ball (mass = 7.2 kg, radius = 0.10 m) and a billiard ball (mass = 0.41 kg, radius = 0.028 m) may each be treated as uniform spheres. What is the magnitude of the maximum gravitational force that each can exert on the other?

    2. Relevant equations

    F=G(m1xm2)/r^2

    3. The attempt at a solution

    i used the equation

    F=[ 6.67x10^-11 ] [7.2] [.41]/1.2^2

    but i keep getting a wrong answer of 1.2 x 10^-8 i dont know what i did wrong.....
     
  2. jcsd
  3. Jun 18, 2007 #2
    I'm so confused, can anyone help me? :/
     
  4. Jun 18, 2007 #3

    Doc Al

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    Staff: Mentor

    What's the distance between their centers?
     
  5. Jun 18, 2007 #4
    i think it's assuming that they're touching so it would be the sum of the radiuses..
     
  6. Jun 18, 2007 #5

    Doc Al

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    Staff: Mentor

    Right. And what would that sum be?
     
  7. Jun 18, 2007 #6
    haha, oops so it's 0.128.... i thought i did that, mustve typed it wrong...but still, taht wouldnt make my way right would it?
     
  8. Jun 18, 2007 #7

    Doc Al

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    Staff: Mentor

    Looks like you did use the correct value for the distance between the centers. I see nothing wrong with your solution.
     
  9. Jun 18, 2007 #8
    i guess it's the way i entered it into webassign :(
     
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