PROBLEM 10.93 Two bars are attached to a single spring of constant kthat is unstretched when the bars are vertical. Determine the range of values of Pfor which the equilibrium of the system is stable in the position shown. SOLUTION First note 2sinsin33LLaθφ==and sin3Ls=For small values of and :2=221coscos2VPksθφ=++()212coscos2sin323PLLkθθ+22sin2sin 2
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