Question: Collar A can slide freely on the semicircular rod shown. Knowing that the constant of the spring is k and that the unstretched length of

Collar A can slide freely on the semicircular rod shown. Knowing that the constant of the spring is k and that the unstretched length of the spring is equal to the radius r, determine the value of Î¸ corresponding to equilibrium when W = 50 lb, r = 9 in., and k =15 lb/in.

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