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Math Help - urgent... gravitational potential between two spheres.

  1. #1
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    urgent... gravitational potential between two spheres.

    two spheres their masses are :m1=m2=1.2x10^-8 kg are placed 10 cm away from each other. (r=10 cm) How is the gravitation potential ( V=?)in the point A which is situated 6 cm away from the first sphere and of course 4 cm away from the second one.

    The result is given and is -2.33 x 10^17J/kg but I can't find how ?
    It has to be with this formula: V=kq/r^2

    Any help is appreciated!
    Thanks...
    Last edited by mr fantastic; October 5th 2009 at 06:54 PM. Reason: Re-titled
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