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Question

The radius of the pump piston of a hydraulic press is equal to 2/5 of the radius of the press piston. Obtain its mechanical advantage.


A

6.25

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B

1.25

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C

0.8

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D

11.25

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Solution

The correct option is A

6.25


Given

radiusofthepumppiston=25radiusofpresspistonletradiusofpresspiston=x,thenpumppiston=25xletforceappliedbeF1andforceexertedbeF2Nowaccordingtopascal'slawpressureappliedoneveryportionofaliquidissameP1=P2F1A1=F2A2---(i)Mechanicaladvantage=forceappliedforceexertednowfrom(i),F1F2=A1A2=πR2π(2R/5)2thusM.A=6.25henceoption(a)isthecorrectanswer.


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