EAS208_HW09_112910

# EAS208_HW09_112910 - EAS 208(Fall 2010 Homework#9 Due...

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EAS 208 (Fall 2010) Homework #9 Due: Wednesday, December 8 at beginning of class Study: Chapters 18, 21.1 – 21.3 (Bedford and Fowler, 5 th edition) Solve Problems: 18.50, 18.60, 18.66, 18.68, 21.63 Solve and Submit Problems 9–1, 9–2, and 9–3 below Problem 9–1 At the instant shown, for the system consisting from the slender bar and the crate connected with the rope (red line), the velocity of the crate is zero and the acceleration of the crate is 2 14 ft s toward the left. The weights of the bar and the crate are and , respectively. Assume that between the horizontal surface and the crate the coefficient of kinetic friction is 40 lb 80 lb 0.2 k μ = . Determine: a) The couple M . b) The tension in the rope. Neglect the weight of the rope (red line). 1

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Problem 9–2 Let θ be the angular displacement of the disk relative to its position when both springs are unstretched. The moment of inertia of the stepped disk is 2 4 O I kg m =− and 0.4 R m = . The stiffness of the linear springs is
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## This document was uploaded on 10/27/2011 for the course EAS 208 at SUNY Buffalo.

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EAS208_HW09_112910 - EAS 208(Fall 2010 Homework#9 Due...

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