ICSE Class 10 Physics 2015 Solved Paper

A block and tackle system has V.R. $=5$ .

Question : 38 of 74

Marks: +1, -0

Rohan exerts a pull of

150 {\Kgf}

. What is the maximum load he can raise with this pulley system if its efficiency

=75 \%

Solution:

Given : V.R.

=5

, Effort

=150 {\kgf}

, Efficiency

=75 \%

\;\text " Efficiency "\;=\;{\;\text " M.A. "\;}/{\;\text " V.R. "\;} × 100

75\;=\;{\;\text " M.A. "\;}/{5} × 100

\;\text " M.A. "\;\;=\;{75 × 5}/{100}=3.75

\;\text " But "\; \;\text " M.A. "\;\;=\;{\;\text " Load "\;}/{\;\text " Effort "\;}

3.75\;=\;{\;\text " Load "\;}/{150 {\kgf}}

\;\text " Load "\;\;=3.75 × 150

\;=562.5 {\kgf} .

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