\(F_{H}=m \omega^{2} \frac{\ell}{2} \sin \theta\)
\(mg \frac{\ell}{2} \sin \theta- m \omega^{2} \frac{\ell}{2} \sin \theta \frac{\ell}{2} \cos \theta=\frac{ m \ell^{2}}{12} \omega^{2} \sin \theta \cos \theta\)
\(\cos \theta=\frac{3}{2} \frac{g}{\omega^{2} \ell}\) \(....(ii)\)