The bob of mass M of a pendulum is fired from rest at position A. If the spring is compressed to a distance δ and released, determine (a) Its stiffness k so that the speed of the bob is zero when it reaches point B, where the radius of curvature is still r, (b) The stiffness k so that when the bob reaches point C the tension in the cord is zero.

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Units Used: Given: KN = 10³ N M = 0.75 kg g = 9.81 8 = 50 mm r = 0.6 m 2 S