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 θ corresponding to equilibrium when m = 20kg, r = 180mm, and k = 3kN/m.

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