The uniform semicircular bar of radius r = 145 mm and mass m = 3.0 kg rotates freely about a horizontal axis through the pivot O. Thebar is initially held in position 1 against the action of the torsional spring and then suddenly released. Determine the spring stiffness KTwhich will give the bar a counterclockwise angular velocity w = 4.8 rad/s when it reaches position 2, at which the spring is undeformed.AKTPart 1Answers:Vg1 =mVg3 =12Measure gravitational potential energy from point O. Find the gravitational potential energy in positions 1 and 2.A'(0)N•mN•m

Answered: The uniform semicircular bar of radius…

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