posted by Donald .
A bowling ball (mass = 7.2 kg, radius = 0.14 m) and a billiard ball (mass = 0.40 kg, radius = 0.028 m) may each be treated as uniform spheres. What is the magnitude of the maximum gravitational force that each can exert on the other?
since the minimum distance between their centers of mass is .14m + .028m = .168m,
plug that into the usual formula.
BTW, who ever heard of a 2.8cm, 400g billiard ball? The standard size and weight are around 5.7cm and 160g.
Maybe a golf ball is 2.8cm. Dunno.