If the spring is unstretched when u = 30 , the mass of the
Chapter 11, Problem 11-16(choose chapter or problem)
If the spring is unstretched when \(\theta = 30^{\circ}\), the mass of the cylinder is 25 kg, and the mechanism is in equilibrium when \(\theta = 45^{\circ}\), determine the stiffness k of the spring. Rod AB slides freely through the collar at A. Neglect the mass of the rods.
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