BRAVO! That's the right answer!

Fg = (6.67 x 10 - 11 N m2/kg2) (108 kg)2/(40 m)2

Fg = (6.67 x 10 - 11) (108)2/(40)2 N

Fg = 420 N

A force of 420 N has very little effect on a one-hundred-thousand-ton oceanliner!

(c) 2003, Doug Davis; all rights reserved.