Beer, Johnston, Eisenberg Vector Mechanics for Engineers – Statics 8 ed Ch8_2007

# Vector Mechanics for Engineers: Statics w/CD-ROM

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PROBLEM 8.8 Ifuowing that the coefficient of static friction between the 30-lb block and the incline is ,u" = 0.25, determine (a) the smallestvalue of P required to maintain the block in equilibriura (b) the conesponding value ofp. wLu^ r^dt-- L fr** I rl ,o 3t" r { = 4ul.o 16" - P I R ? n l l ^ v v ' 1 il]oo f! =< :qG,o'o _l_ S'r n -{ ;r-00-o\ \ ,-*-9-L d, = t-^--' ( o, ,r) l - n = - - 0 ; tb ) = a l , L , l b \.

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PROBLEM 8.19 The hydrauliccylinder exerts on pin B a force of 600 lb directed to the right. Determine the moment of the friction force about the axle of the drum when the drum is\$uting (a) clockwise, (b) counterclockwise. FB\ 5b o^r^"^ : (UooruXr",^)" tr (u,) - u(rr,) re-c"-\\ 'P: N*- t.. I- n , - F v \ -4u Fut s6 { 0A5= c^&-s*^ - r=t'oi^) - IYf b) Fc) C(n TO\ *'-l \'F rds'b \i:""[email protected] 4n-'.*^ 2 rn* {rn* = zboO lb,'rr^ + tr(rrl^) - t: (#) F = b6,b+ \t \p;E,t,am] rnob,*-.- \a,: bU6,t"1 \t.\n f{ = 5S.SU \t,+ Es\p = F (ro,) :- fi
I/z T S)vnnn -I PROBLEM 8.30 The lift-tong mechanism shown consists of twin four-bar linkages and is usedto lift a 40-kg machine component. Knowing that LAB = 36 mrn, determine the smallest allowable value of the coefficient of static friction between the component and the gtpping pads when (a) d = A, (b) a = 30'. (Hint: Assume that lines drawn through pinsI and C and G andlare vertical for all vales of a.) f : - l \ = i!,.

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