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**1. Homework Statement**

Four 7.5kg spheres are located at the corners of a square of side 0.70 m.

Calculate the magnitude of the gravitational force exerted on one sphere which is in left and down corner of the square by the other three.

**2. Homework Equations**

F_tot = F_2 + sqrt(2) * F1

**3. The Attempt at a Solution**

came up with that equation, but it says i am wrong.

can anyone help/