PROBLEM 10.94 Bar ACis attached to a hinge at Aand to a spring of constant kthat is undeformed when the bar is vertical. Knowing that the spring can act in either tension or compression, determine the range of values of Pfor which the equilibrium of the system is stable in the position shown. SOLUTION Consider a small disturbance of the system defined by the angle .θHave 2sinsinCxaaφ==For small :2=Now, the Potential Energy is 212BEVkxPy=+where
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