The uniform rod AB is suspended in air and its two ends are attached to supports by hinges.The rod has a weight of 15 lb and the spring is unstretched when θ = 0°. If θ = 30°, determine the stiffness k of the spring so that the rod is in equilibrium.

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  1. You need to describe the system better, since there is no figure. Where is the spring attached? In what direction does it pull or push? How is theta measured?

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