The slender 6-kg bar AB is horizontal and at rest and the spring is unstretched
Chapter 18, Problem 18-58(choose chapter or problem)
The slender 6-kg bar AB is horizontal and at rest and the spring is unstretched. Determine the stiffness k of the spring so that the motion of the bar is momentarily stopped when it has rotated clockwise \(90^{\circ}\) after being released.
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