1-30.The rope in a block and tackle iscalled a1–26.The mechanical advantage of thelever pictured in figure 1J is1.five2.six3.seven4.one–sixth1–27.The combination dog and wedge oftextbook figure 1-10 is a complexmachine since it consists of whichtwo simple machines?1.Lever and the screw2.Two first–class levers3.Lever and the inclined plane4.One first-class lever and onesecond-class leverInformation for questions 1-28 and$1-29:The handle of a hatch dog is9 inches long.The short arm is 3 incheslong.1-28.What is the mechanical advantage ofthe hatch dog?1. 122. 273. 34. 91–29.With how much force must you pushdown on the handle to exert 210pounds force on the end of theshort arm?1.105 lb2.80 lb3.70 lb4.25 lb1.runner2.line3.fall4.sheave1-31.The theoretical mechanicaladvantage of the single sheaveblock of textbook figure 2-2 is1.one2.two3.one-half4.zero1-32.A single block-and-fall rigged as arunner has a theoretical mechanicaladvantage of1.one2.two3.one–half4.four1-33.In a block and tackle having amechanical advantage greater thanone, how does the distance the loadmoves compare with the length ofthe rope which is pulled throughthe block?1.It is less2.It is the same3.It is greater4.It depends on the weight of theload1-34.What advantage can you obtain byreplacing the single fixed block oftextbook figure 2-3 with the guntackle purchase of textbook figure2-6?1.You can pull the rope from amore convenient position2.You need to exert about 1/3 asmuch effort to lift the sameload3.You can lift the same load in1/2 the time4.You need to exert about 1/2 asmuch effort to lift the sameload5
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