621_Dynamics 11ed Manual

621_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Engineering Mechanics - Dynamics Chapter 18 Problem 18-42 When slender bar AB of mass M is horizontal it is 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 downward 90°. Given: M 10 kg = a 1.5 m = b 1.5 m = g 9.81 m s 2 = Solution: 00 + 0 1 2 ka b + () 2 a 2 + b 2 + Mg a 2 = k Mga ab + 2 a 2 + b 2 = k 42.8 N m = Problem 18-43 The disk of weight W is rotating about pin A in the vertical plane with an angular velocity
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This note was uploaded on 08/16/2011 for the course EGN 3321 taught by Professor Christianfeldt during the Spring '08 term at University of Central Florida.

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