Universal law of gravitation?

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Parcerita

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I want to make sure this is correct. Please tell me if I did it right.

Calculate the force of gravity between two bowling balls each of which has a mass of 8.0kg, when they are 0.50m apart (center to center).

F=Gm1m2/r^2
F=(6.67x10^-11)(8.0)(8.0)/0.50^2
F=1.7x10^-8

Thanks
 
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