Homework Help: physics

Posted by stoic-rider77 on Sunday, November 25, 2012 at 10:13pm.

A 5.1-kg bowling ball and a 8.4-kg bowling ball rest on a rack 0.50 m apart.
(a) What is the force of gravity exerted on each of the balls by the other ball?
(b) At what separation is the force of gravity between the balls equal to 2.0e-9 N?

physics - drwls, Monday, November 26, 2012 at 12:10am
(a) The forces are equal and opposite in direction.
F = G*M1*M2/R^2
It's Newton's law of gravity. Learn it. Look up the constant G and solve for F.

(b) let F = 2.0*10^-9 N in the equation above and solve for separation R.

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