Collar A can slide freely on the semicircular rod shown.
Chapter 10, Problem 10.87(choose chapter or problem)
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 u corresponding to equilibrium when W = 50 lb, r = 9 in., and k = 15 lb/in.
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