85_Problem CHAPTER 10

85_Problem CHAPTER 10 - PROBLEM 10.75 Angle is equal to 45...

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PROBLEM 10.75 Angle θ is equal to 45° after 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 , = ° determine the value of m and state whether the equilibrium is stable, unstable, or neutral. SOLUTION Potential Energy Have 2 1 2 SP B Vk x m g y =+ where () 00 , 100 mm, 20 rad 9 SP xr r π θθ =− = = ° = cos , 450 mm == BA B A B yL L Then 2 2 0 1 cos 2 + AB r m g L and 2 0 sin AB dV kr mgL d 2 2 2 cos AB dV kr mgL d With
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This note was uploaded on 07/11/2011 for the course EGM 2511 taught by Professor Jenkins during the Spring '08 term at University of Florida.

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