In a block and tackle system consisting of $3$ pulleys, a load of $75 k g f$ is raised with an effort of $25 k g f$ Find the efficiency?

100 %

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10 %

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200 %

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500 %

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Solution

The correct option is A $100 %$
FOR This Question Use the formula $M A = \frac{F_{o u t}}{F_{i n}}$
$F_{o u t} = 75 k g f$
$F_{i n} = 25 k g f$
Solving this we get the value of $M A = 3$
And $V R = N u m b e r o f p u l l e y = 3$
$η = \frac{M A}{V R} * 100$
Put the values of following and we get $η = 100 %$

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In a block and tackle system consisting of 3 pulleys, a load of 75kgf is raised with an effort of 25kgfFind the efficiency?

The correct option is A 100%FOR This Question Use the formula MA=FoutFinFout=75kgf Fin=25kgfSolving this we get the value of MA=3And VR=Numberofpulley=3η=MAVR∗100Put the values of following and we get η=100%

In a block and tackle system consisting of $3$ pulleys, a load of $75 k g f$ is raised with an effort of $25 k g f$ Find the efficiency?