A uniform sphere with mass 60.0 kg is held with its center at the origin, and a second uniform sphere with mass 80.0 kg is held with its center at the point x=0, y=3.00m.
(a) What are the magnitude and direction of the net gravitational force due to these objects on a third uniform sphere with mass 0.500 kg placed at the point x = 4.00m, y=0?
(b) Where, other than infinitely far away, could the third sphere he placed such that the net gravitational force acting on it from the other two spheres is equal to zero?