COSMOS Chapter 6 Solution 74 | Answer Key - Edubirdie

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Michigan State University
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ERG 160 | Success in Science, Technology, Engineering, and Mathematics
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2021
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1
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agatoary6zt

COSMOS: Complete Online Solutions Manual Organization System Chapter 6, Solution 74. Structure (a): No. of members m = 12 No. of joints n=8 m + r = 16 = 2n No. of react. comps. r =4 unks = eqns FBD of EH: ΣM H = 0 → FDE ; ΣFx = 0 → FGH ; ΣFy = 0 → H y Then ABCDGF is a simple truss and all forces can be determined. This example is completely constrained and determinate. ! Structure (b): No. of members m = 12 No. of joints n=8 m + r = 15 < 2n = 16 No. of react. comps. r =3 unks < eqns partially constrained ! Note: Quadrilateral DEHG can collapse with joint D moving downward: in (a) the roller at F prevents this action. Structure (c): No. of members m = 13 No. of joints n=8 m + r = 17 > 2n = 16 No. of react. comps. r =4 unks > eqns completely constrained but indeterminate ! 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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