196_Dynamics 11ed Manual

196_Dynamics 11ed Manual - the supporting cables are...

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Engineering Mechanics - Dynamics Chapter 13 Problem 13-66 The man has weight W and lies against the cushion for which the coefficient of static friction is μ s . If he rotates about the z axis with a constant speed v , determine the smallest angle θ of the cushion at which he will begin to slip off. Given: W 150 lb = s 0.5 = v 30 ft s = d 8f t = Solution: Assume verge of slipping Guesses F N 1lb θ 20 deg = Given F N θ μ s F N θ () W g v 2 d = F N θ () W μ s F N θ () 0 = F θ Find F θ , () = F N 487.563 lb θ 47.463 deg = Problem 13-67
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Unformatted text preview: the supporting cables are directed at angle q from the vertical. Each chair including its passenger has a mass m c . Also, what are the components of force in the n, t, and b directions which the chair exerts on a passenger of mass m p during the motion? Given: 30 deg = d 4 m = m c 80 kg = b 6 m = m p 50kg = g 9.81 m s 2 = Solution: The initial guesses: T 100 N = v 10 m s = 194...
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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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