Question

A block and tackle system has V.R $=5$
$\left(i\right)$ Draw a neat labelled diagram of a system indicating the direction of its load and effort.
$\left(ii\right)$ Rohan exerts a pull of $150$ $kgf$. What is the maximum load he can raise with this pulley system if its efficiency is $75$%?

Answer 1

$\left(i\right)$ Diagram of a system indicating the direction of its load and effort is given.

$\left(ii\right)$ Efficiency $=\frac{M.A}{V.R}\times 100$

$75=\frac{M.A}{5}\times 100$

$M.A.=\frac{75\times 5}{100}=3.75$

$M.A=\frac{Load}{Effort}$

$3.75=\frac{Load}{150kgf}$

Load $=3.75\times 150$

$=562.5kgf$