Four 7.5 kg spheres are located at the corners of a square of side 0.74 m. Calculate the magnitude and direction of the gravitational force on one sphere due to the other three.

Answer 1

Use symettry. YOu know the force will be diagonal.
the side components will be
2G*m^2/.74^2 Cos45
and the diagonal will be
G*m^2/(.74*1.414)^2

add

Answer 2

i got 1.71E-8 and that was wrong and then i got 1.03E-8 and it was still wrong

Answer 3

with sig figs the answer should be
2.0*10^-8 N towards the center of the circle