COSMOS Chapter 8 Solution 86 | Michigan State University - Edubirdie

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

2020
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179

Pages:

1
Author:

Campbell Wagner

COSMOS: Complete Online Solutions Manual Organization System Chapter 8, Solution 86. FBD gate: ( ) = 24 kg ( 9.81 m/s ) = 235.44 N W1 = 66 kg 9.81 m/s 2 = 647.46 N W2 2 ( rf = rs sin φs = rs sin tan −1 µ s ( ) * ) = ( 0.012 m ) sin tan −1 0.2 = 0.0023534 m ΣM C = 0: ( 0.6 m + rf )W1 + ( 0.15 m + rf ) P − (1.8 m − rf )W2 = 0 P= (1.79765 m )( 235.44 N ) − ( 0.60235 m )( 647.46 N ) 0.15235 m = 218.19 N P = 218 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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