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ThreeFrictionExamples

ThreeFrictionExamples - 5/7 The tongs are used to handle...

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Unformatted text preview: 5/7 The tongs are used to handle hot steel tubes that F W are being heat treated in an oil bath. For a 20° jaw 5/ 7 . Opening, what is the minimum coefficient of static F #- friction between the jaws and the ttibe that will 20° enable the tongs to grip the tube without slipping? l 2 L’ ' t ‘F Ax ‘20 am" ivy sea war/mew ‘ F Problem 6/7 FarmEn-F—+—P:/IASH 4 F: arm «WWW W:- :12}; :- /0‘( “‘3? l 6/31 What for " P must the two men exert on the rope to m the uniform 20—ft plank on the overhead 6/‘3l rack? The plank weighs 200 lb, and the coefficient of kinetic friction between the plank and each ‘ V support is _0.50. Ans. P: 162.3 lb 260 Y 1’ A7 57 Ptoblem 6/31 , O 2MA30 = E"! (12% 2%(8) - Psm30(|8)—+ By ‘ 1;” *3“? 2MB=O = ZOO(¢)—A~,(IZ)- Pail/130(6) 4A7 = 2—? ”j P ZFX :0 5' 'SAY 4.",ng “ 77605-30 , .L('A,1+ 3%),- Facts £0 $600+? +3? 3343) P0033“) gl 35‘M3 0.93:7) ,. P(2,_fco$§o> _____.37 ?= I6: 3 It; J7W=zoolia (0/5! 'T‘PF‘Y‘éy FBD s N 50 B éMgrO 4‘? RiP 2352:: (4’) ~ Pfipsi‘n'so (6') =0 139+; = 2957195} Plant: wm SLibE bath“? 3 “PS“ , , 80—kg man can reach without causing the hinged é/qoifj stepladder to collapse. The coefficient of static - friction at A is 0.40 and that at B is 0.50, and each of the two uniform sections of the hinged ladder has a mass of 10 kg. Ans. h = 2.37 m FBDdF “am: 212,: owA+B=931 X- ”X FBD©EHH:O 43 0: B(4m:éo°)[email protected];nw)-9a1(zmsso) 73 ' 3 2366.} M 2 =0 #14? :265 2 {so amass W FBDQ iMA SO ‘ .I A 'flbofl HXC455n60)[email protected]—¢550)"98.!(2m560)-781.8(%;w)=o . 283 7‘5 2.53 2 —9g_ _—_ 751.8 .( 2—)+ ( ) I ‘wm'fléo {AK t Z-S’ffihl =- — - 4 S'.'. In‘ ‘mkAssuM 1m FBWZFK=OaPA=I85 .‘1A=-‘1(98*-"33 Am! 366)—245” “9’53 2‘3 mg? ...
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