Answer
$68\;lb$.
Work Step by Step
The given values are
The given values are
$F_l=5100\;lb$.
$MA=\frac{75}{1}$
Formula for the mechanical advantage is
$\Rightarrow MA=\frac{F_l}{F_s}$
Substitute all the values.
$\Rightarrow \frac{75}{1}=\frac{5100\;lb}{F_s}$
Cross multiply.
$\Rightarrow 75F_s=5100\;lb$
Divide both sides by $75$.
$\Rightarrow F_s=68\;lb$
Hence, the $F_s$ is $68\;lb$.
