Question:
Four 7.5-kg spheres are located at the corners of a square of side 0.80 m. Calculate the magnitude and direction of the gravitational force exerted on one sphere by the other three.
Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Quick Answer:
$1.1\times 10^{-8}\textrm{ N}$
Giancoli 7th Edition, Chapter 5, Problem 42
(4:18)