PROBLEM 10.79 A slender rod AB, of mass m, is attached to two blocks AandBthat can move freely in the guides shown. The constant of the spring is k, and the spring is unstretched when ABis horizontal. Neglecting the weight of the blocks, derive an equation in,θm, l, and kthat must be satisfied when the rod is in equilibrium. SOLUTION Elongation of Spring: sincosslll=+−( )sincos1slθθ=+−Potential Energy:
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