90_Problem CHAPTER 10

90_Problem CHAPTER 10 - PROBLEM 10.79 A slender rod AB of...

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PROBLEM 10.79 A slender rod AB , of mass m , is attached to two blocks A and B that can move freely in the guides shown. The constant of the spring is k , and the spring is unstretched when AB is horizontal. Neglecting the weight of the blocks, derive an equation in , θ m , l , and k that must be satisfied when the rod is in equilibrium. SOLUTION Elongation of Spring: sin cos s lll =+− ( ) sin cos 1 sl θθ =+ Potential Energy:
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