1. The problem statement, all variables and given/known data Question: Four 8.0 kg spheres are located at the corners of a square of side 0.50m. Calculate the magnitude and direction of the gravitational force on one sphere due to the other three. Answer from Back of Textbook: 3.3 x10^-8 N toward diagonally opposite sphere 2. Relevant equations F = (Gm1m2)/r^2 m1 = mass1 m2 = mass2 G = constant 6.67 x 10^-11 r = radius g = (Gm)/r^2 g = acceleration due to gravity. I believe that these are the only two applicable to this question. 3. The attempt at a solution Er, its kinda hard to attempt it if you don't have a clue what's going on. If someone could just push me in the right direction and give me a hint as to where to start, that would be awesome!