1–67.1–68.1-69.0If a force of 133 pounds isactually required to move the crateup the inclined plane, the amountof force expended in overcomingfriction is1.20 lb2.33 lb3.58 lb4.66 lbSince a force of 133 pounds wasexerted in moving the crate up theinclined plane, the actualmechanical advantage is1.1/32.2 1/33. 34. 4A 3,000–pound automobile is towedup a ramp 150 feet long runningfrom the street floor to the secondfloor of a garage. The towingforce required was 300 pounds.What is the distance between floorsif 20 pounds of force were neededto overcome frictional resistance?1.8.6 ft2. 10 ft3. 14 ft4. 15 ftInformation for questions 1–70 and1–71:By exerting an effort of 115pounds, you move a 300–pound crate up aninclined plane 12 feet long to a truck bedthree feet above the sidewalk.1–70.What is the theoretical mechanicaladvantage of the inclined plane?1.One2.Two3.Three4.Four1–71.How much of your effort is used toovercome friction?1.35 lb2.40 lb3.75 lb4.115 lb1–72.What is the characteristic shape ofwedges which have a high mechanicaladvantage?1.Short and thick2.Long and thin3.Long and thick4.Short and thin1–73.If a wedge is 6 inches long, 3inches wide, and 1 1/2 inches thickat the top, the theoreticalmechanical advantage is1.1 1/22. 23. 34. 41–74.A member of a damage control partyuses a maul to drive a wedge inbehind a shore to tighten up adamaged bulkhead.The wedge is 15inches long and 3 inches thick atthe butt.How many pounds of forcewill be delivered against the faceof the wedge by an 80–pound blow onthe wedge butt with the maul?1.80 lb2.240 lb3.400 lb4.1,200 lb1-75.A 60–pound blow delivered againstthe 3/4–inch–thick butt end of awedge results in an effectivesplitting force of 480 pounds.Howlong is the wedge?1.3 in2.4 in3.6 in4.8 in11

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