296_Dynamics 11ed Manual

296_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Engineering Mechanics - Dynamics Chapter 14 Problem 14-85 The bob of mass M of a pendulum is fired from rest at position A . If the spring is compressed to a distance δ and released, determine (a) its stiffness k so that the speed of the bob is zero when it reaches point B , where the radius of curvature is still r , and (b) the stiffness k so that when the bob reaches point C the tension in the cord is zero. Units Used: kN 10 3 N = Given: M 0.75 kg = g 9.81 m s 2 = 50 mm = r 0.6 m = Solution: At B : 1 2 k 2 Mgr = k 2 2 = k 3.53 kN m = At C : M gM v C 2 2 r = v C
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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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