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InterviewSolution
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The pitch of a screw ina screw jack A is half that of another screw jack B. for 5 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» <P> Solution :Since the HEIGHT of lifting the car by aJack depends on the PITCH of the screw, and for one rotation of the LEVER, the screw moves up bya distance equal to its pitch.Therefore, greater the pitch, higher the car gets lifted, same is the Jack'2' that it will raise the car high, and same is case of screw jack. `(w)/(E)=(2pi L)/(P)` ` :.E = (W xx P)/(2 pi L)` The work done by The two jacks is equal and the length of their levers is equal, E ` prop` pitch. If pitch increases, effort increases. |
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