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83_Problem CHAPTER 10 - PROBLEM 10.73 Using the method of...

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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 2 1 , 2 K θ where K is the torsional spring constant and θ is the angle of twist.) SOLUTION Potential Energy 2 1 sin 2 V K Pl θ θ = cos dV K Pl d θ θ θ = 2 2 sin d V K Pl d θ θ = + Equilibrium: 0: cos dV
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