A uniform rod of mass 250 g having length 100 cm is balanced on a sharp edge at 40 cm mark. A mass o

Question

A uniform rod of mass 250 g having length 100 cm is balanced on a sharp edge at 40 cm mark. A mass of 400 g is suspended at 10 cm mark. To maintain the balance of the rod, the mass to be suspended at 90 cm mark, is\

Professor PC Thomas Classes · Answer

$ \begin{aligned} 	au_{	ext {net }} & =0 \ 	ext { or }(30 	imes 400 \mathrm{~g})  & =(250 \mathrm{~g} 	imes 10)+(m \mathrm{~g} 	imes 50) \ m & =\frac{(12000-2500)}{50}=\frac{9500}{50} \ m & =190 \mathrm{~g} \end{aligned} $