Posted by Tanner on Thursday, June 7, 2012 at 8:29am.
G•m²/R =k•q²/R,
q=m•sqrt(G/k)=
=2.88•sqrt(6.67•10^-11 /9•10^9) =2.48•10^-10 C,
N =q/e=2.48•10^-10/1.6•10^-19 =1.55•10^9
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