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Determine the small gravitational force F which the copper sphere exerts on the steel sphere. Both spheres are homogeneous, and the value of r is 65 mm. Express your result as a vector. Assume a = 4.9r, b = 2.8r, c = 0.6r. Copper Answer: F = (i 40.1 Steel b x i+i 22.8 j) (10⁹) N