Case\(-I\)
Clockwise moment \(=W \times L_1\)
anticlock wise moment \(=18 \times L_2\)
\(\Rightarrow L_1=18 \times L_2\)
\(\Rightarrow \frac{L_1}{L_2}=\frac{18}{\omega}\)
Similarly,
Care \(- II\)
\(W \times L_2=8 \times L_1\)
\(\Rightarrow \frac{L_1}{L_2}=\frac{W}{8}\)
equating \((i)\) and \((III)\)
\(\omega^2=18 \times 8=144\)
\(\Rightarrow \omega=\sqrt{144}=12\,kg\)