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HW1 F10 - M 33g 3W 4oro H^ l PaI,QN W.ftS I(l^fuu wh The...

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(l^fuu wh M( 33g 3W 4oro H^/ l PaI,QN I W.ftS The basic features of a small backhoe are shown in the illustration. Member .BE (complete with hydraulic cylinder CD and bucket-control linke DF and DE) weighe 600 lb s.ith ma$s oenter at G1. The bucket and its load of clay weigh g5O Ib with mass center et Gz. To disclose the opera- tional deign characteristics of the backhoe,d,e+ trtrrtiruan+etot the force f in the hydrautic ryl- inder AB ag a function of the aryular position 0 of member BE over the range 0 < 0 s 9ff. For what value of d is the force ? equal to zero? Mem- ber OH is fixed for this exercise; note that its contrnlling hydraulic cylinder (hidden) ertends fmm near point O to pin I. Similarly, the bucket- cuntral hydraulic cylinder CD iE held at a frxed length.
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oav, ul uJ uJ tEEtr ({(r l3fm* 888= .ololoE tttl ooaa FFFF ltl|rluttrl ul ut uJ I! I-I- oarvro 8888 FOJOI tttl ro(oNI\ ct g, (o c) s$$F (D(r('r(D ur = o o * (* /yno,{ (urwt, il}&{W, -ft- fra^ ll"l'l'^ A ":" 2, fuur!" Un ,lu4vffid u'frfrtw lrlfirn U!/* 4o(* 'l e tlW,rtlru" F=O, A)ilC b'#r oq&M^/"d (rffi AuA/^ F'ho167 #ft d." lr,^ AfuL n tl ,e tU.
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