Physics - Rotation Question with Solution | TestHub

As shown in the figure rod of mass m and length $\ell$ is hinged at O at one end and free to rotate in vertical plane. A force F of magnitude mg is applied on another end of rod which always act perpendicular to the rod. Force is start acting at time $\mathrm{t}=0$ (as shown). Find vertical component of normal reaction acting on rod when rod become horizontal for $3^{\text{rd }}$ time:- (given $\mathrm{m}=2\mathrm{kg},\ell =1\mathrm{m},\mathrm{g}=10\mathrm{m}/{\mathrm{s}}^2$ )