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S in ce CD i s a two- fo r ce m em b er , th e force it exe rt s o n m e mb e r ABD i s d ir ec t ed a l o n g DC . Fr e e-Bod y Diagram of A BD : ( Thr ee-F o rc e m e mb e r ) E 3 tana=- = . 6 5 a = 30.964 AE= I O tan a=6 in . GE = AE- AG = 6- 1 . 5 = 4.5 in . GB 3 tan jJ =- =- GE 4.5 jJ = 33.690 B D 50 l b sin 1 20.964 s in 33 . 690 sin 25 . 346 50 I b " \0 + oc .- = ' ' 2 . o :' 1~+o ~ ~oo-t: /.._~ =Z5" . 3~"o B = 100.155 1b D = 6 4 .789 Ib B = 1 00.2 I b ~ 56.3 .. C = D = 64.8 I b ~ 31 . .. PR O PRI ETA R Y MA T E RI AL . c 2010 The McGraw-Hi li Co m pa n ies , I nc , A ll ri g ht s re s er. ' e d , , Y o p a ri of Il 1 i s , I! a lllwlmm ' b e di s p ! m 'e J . r e p r o dll ce d o r dis lr ih lli e d i n a nI ' / o rm o r hy ( / I l l ' m e an s , \I ' ii/l O lIl Il1 e pri o r \ lTill e ll p e rmi s si o n o f Ih e p ll h li s h e r, o r II s e d h e nm d I h e li ll li l e d dis lri b llli o lll O l ea c h e rs a lld " d l/ CO l O r S p e rmill... View Full Document

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