643_Dynamics 11ed Manual

643_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Engineering Mechanics - Dynamics Chapter 19 Solution: 0 Pt 2 r () + 1 2 W g r 2 ω W g r r + = 4 Ptg 3 rW = 11.4 rad s = Problem 19-17 The drum has mass M , radius r , and radius of gyration k O . If the coefficients of static and kinetic friction at A are μ s and k respectively, determine the drum's angular velocity at time t after it is released from rest. Given: M 70 kg = s 0.4 = θ 30 deg = r 300mm = k 0.3 = g 9.81 m s 2 = k O 125 mm = t 2s = Solution: Assume no slip Guesses F f 1N = F N = 1 rad s = v 1 m s = F max = Given 0 F f rt + Mk O 2 = v r = F max s F N = Mg sin tF f t Mv = F N tM g cos t 0 = F f F max F N v Find F f F max , F N , , v , = F f F max F N
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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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