86_Problem CHAPTER 10

86_Problem CHAPTER 10 - PROBLEM 10.76 A block of mass m is...

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PROBLEM 10.76 A block of mass m is hung from member AB as shown. Neglecting the mass of AB and knowing that the spring is unstretched when 20 , θ determine the value of corresponding to equilibrium when 3 kg. m = State whether the equilibrium is stable, unstable, or neutral. SOLUTION Using the general results of Problem 10.76 and noting that now 0 3 kg, and 20 m == ° we have Equilibrium () 2 0 0: sin 0 AB dV kr mgL d θθ =− = ( ) 2 2
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