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InterviewSolution
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The pitch of a screw in a screw jack A is half that of another screw jack B. for 10 complete rotations of the lever, which one of the jack will lift a car more higher? Which one need more effort to do an equal work if both the jacks have livers of equal length? |
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Answer» For one rotation of the lever, the screw moves up by a distance equal to its pitch. `:. ` greater the pitch, higher the car gets lifted. `rArr` Jack B lifts the load higher In thew case of a screw jack, `(W)/(E)=(2 pi L)/(P)` `:. E = (W xx P)/(2 pi L)` As the work done by the two jacks is equal, and the length of their levers is equal, the effort is directly proportional to the pitch, i.e., as the pitch increases, the effort to be applied also increases. Hence, jack B needs more effort. |
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