PROBLEM 10.73 Using the method of Section 10.8, solve Problem 10.39. Determine whether the equilibrium is stable, unstable or neutral. (Hint:The potential energy corresponding to the couple exerted by a torsional spring is 21,2Kθwhere Kis the torsional spring constant and θis the angle of twist.) SOLUTION Potential Energy 21sin2VKPlθθ=−cosdVKPldθθθ=−22sind VKPldθθ=+Equilibrium:0:cosdV
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