COSMOS Chapter 8 Solution 80 | Answer Key - Edubirdie

University:
Michigan State University
Course:
ERG 160 | Success in Science, Technology, Engineering, and Mathematics
Academic year:

2021
Views:

216

Pages:

1
Author:

Caroline Mcfarland

COSMOS: Complete Online Solutions Manual Organization System Chapter 8, Solution 80. (a) FBD lever (Impending CW rotation): ΣM C = 0: ( 0.2 m + rf ) ( 75 N ) − ( 0.12 m − rf ) (130 N ) = 0 rf = 0.0029268 m = 2.9268 mm sin φs = rf rs *  −1 rf   −1 2.9268 mm  µ s = tan φs = tan  sin  = tan  sin  18 mm  rs    = 0.34389 µ s = 0.344 (b) FBD lever (Impending CCW rotation): ( 0.20 m − 0.0029268 m )( 75 N ) ΣM D = 0: − ( 0.12 m + 0.0029268 m ) P = 0 P = 120.2 N NOTE FOR PROBLEMS 8.75–8.89 ( ) Note to instructors: In this manual, the simplification sin tan −1 µ ≈ µ is NOT used in the solution of journal bearing and axle friction problems. While this approximation may be valid for very small values of µ , there is little if any reason to use it, and the error may be significant. For example, in Problems 8.76–8.79, µ s = 0.50, and the error made by using the approximation is about 11.8%. Vector Mechanics for Engineers: Statics and Dynamics, 8/e, Ferdinand P. Beer, E. Russell Johnston, Jr., Elliot R. Eisenberg, William E. Clausen, David Mazurek, Phillip J. Cornwell © 2007 The McGraw-Hill Companies.

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