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Sol Cap 02 - Edicion 8

COSMOS: Complete Online

COSMOS: Complete Online Solutions Manual Organization System Chapter 2, Solution 86. (a) Have F = Fcosθ x x ( ) F = 320 N cos104.5° x F =− 80.122 N x F =− 80.1 N ! x Then: 2 2 2 2 = x + y + z F F F F 2 ( 320 N) = ( − 80.122 N) + + ( − 120 N) 2 2 F 2 y F y = 285.62 N F = 286 N ! y (b) cosθ = y cosθ = y F y F 285.62 N 320 N θ = 26.8°! y cosθ = z Fz F cos θ z = −120 N 320 N θ = 112.0°! z 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.

COSMOS: Complete Online Solutions Manual Organization System Chapter 2, Solution 87. !!!" DB = i − j − k ( 36 in. ) ( 42 in. ) ( 36 in. ) ( ) ( ) ( ) 2 2 2 DB = 36 in. + − 42 in. + − 36 in. = 66 in. T = T λ = T DB DB DB DB !!!" DB DB T 55 lb ( 36 in. ) ( 42 in. ) ( 36 in. ) DB = 66 in. ⎡ ⎣ i − j − k ⎤ ⎦ ( 30 lb) ( 35 lb) ( 30 lb) = i − j − k T = ! ∴ ( ) 30.0 lb DB x ( ) 35.0 lb T =− ! DB y ( ) 30.0 lb T =− ! DB z 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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