1–21.Refer to figure 1F.If a personexerts at point B a pull of 60pounds on the claw hammer shown,what is the resistance that thenail offers?1.60 lb2.120 lb3.480 lb4.730 lb1–22.Which of the following definitionsdescribes the mechanical advantageof1.2.3.4.the lever?Effort that must be applied toovercome the resistance of anobject divided by theresistance of the objectAmount of work obtained fromthe effort appliedGain in power obtained by theuse of the leverResistance offered by an objectdivided by the effort whichmust be applied to overcomethis resistance1–23.The mechanical advantage of leverscan be determined by dividing thelength of the effort arm by the1.distance between the load andthe point where effort isapplied2.distance between the fulcrumand the point where effort isapplied3.distance between the load andthe fulcrum4.amount of resistance offered bythe object1–24.The mechanical advantage of thelever in figure 1G is1.one–fifth2.one-fourth3.four4.five1–25.The mechanical advantage of thelever in figure 1H is1.one2.two3.one–half4.one–fourth4
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