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Homework Help: Gravitational Force

  1. Nov 22, 2003 #1
    Problem 15.
    Given: G=6.673*10^-11 N*m^2/kg^2.
    If the gavitational force between the electron(9.61*10^-31kg) and the proton (1.59*10^-27kg)in a hydrogen atom is 1.2*10^-47 N,how far apart are the two particles? Answer in units of m. Note: I got 9.197872041*10^-11 by r = sqrt(6.673*10^-11*9.61*10^-31*1.59*10^-27/(1.2*10^-47)). Is the answer correct?
  2. jcsd
  3. Nov 22, 2003 #2


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    Gold Member

    I think you've rounded up the answer somewhere as using those figures I get 9.217861.. x 10-11 m, how many sig. figs did they ask you for? I'd go for two sig figs as that's what they gave the force to, so the answer would be 9.2 x 10-11 m.
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