A thin rod with mass M = 5.79 kg is bent in a semicircle of radius R = 0.618 m (the figure below). (a) What is its gravitational force (both magnitude and direction) on a particle with mass m = 4.33×10-3 kg at P, the center of curvature? (b) What would be the force on the particle if the rod were a complete circle?

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What do you think by symmetry would happen in case of a full circular loop?

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