COSMOS Chapter 3 Solution 87 - Edubirdie

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

2024
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312

Pages:

1
Author:

Apolenajz

COSMOS: Complete Online Solutions Manual Organization System Chapter 3, Solution 87. (a) Have ΣF : FB + FC + FD = FA Since FB = − FD ∴ FA = FC = 22 lb 20° or FA = 22.0 lb Have ΣM A : 20° − FBT ( r ) − FCT ( r ) + FDT ( r ) = M A − ( 28 lb ) sin15° (8 in.) − ( 22 lb ) sin 25°  (8 in.) + ( 28 lb ) sin 45° (8 in.) = M A M A = 26.036 lb ⋅ in. or M A = 26.0 lb ⋅ in. (b) Have ΣF : FA = FE or FE = 22.0 lb ΣM : ∴ 20° M A = [ FE cos 20°] ( a ) 26.036 lb ⋅ in. = ( 22 lb ) cos 20°  ( a ) a = 1.25941 in. or a = 1.259 in. Below A .

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