ICSE Class 10 Physics 2016 Solved Paper

Question : 34 of 73

Marks: +1, -0

A pulley system has three pulleys. A load of

120 {\N}

is overcome by applying an effort of 50N. Calculate the Mechanical Advantage and Efficiency of this system.

Solution:

Given :

{\E}=50 {\N}, {\L}=120 {\N}, {\V} . {\R}=3

(No. of pulleys in system).

\;\text " M.A. "\;=\;{\;\text " Load "\;}/{\;\text " Effort "\;}=\;{120}/{50}=2.4 \;\text " Ans. "\;

\;\text " Efficiency "\;\;=\;{\;\text " Mechanical Advantage "\;}/{\;\text " Velocity Ratio "\;}

× 100 \%

\;=\;{2 .4}/{3} × 100=\;{240}/{3}

\;=80 \% .

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