COSMOS Chapter 6 Solution 72 | Answer Key - Edubirdie

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

2019
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19

Pages:

1
Author:

Athena Harrison

COSMOS: Complete Online Solutions Manual Organization System Chapter 6, Solution 72. Structure (a): Simple truss (start with ABC and add joints alphabetical to complete truss), with r = 4, m = 13, n = 8 r + m = 17 > 2n = 16 so Structure is completely constrained but indeterminate. ! Structure (b): From FBD II: FBD I: FBD II: ΣM G = 0 ⇒ Jy ΣFx = 0 ⇒ Fx ΣM A = 0 ⇒ Fy ΣFy = 0 ⇒ Ay ΣFx = 0 ⇒ Ax ΣFy = 0 ⇒ Gy Thus have two simple trusses with all reactions known, so structure is completely constrained and determinate. ! Structure (c): Structure has r = 4, m = 13, n = 9 so r + m = 17 < 2n = 18, structure is partially constrained ! 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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