\(W_{e q}=m g-m \omega^2 R\)
\(\Rightarrow m g-m \omega^2 R=0\)
\(\Rightarrow \omega^2 R=g\)
\(\omega=\sqrt{\frac{g}{R}}\)
\(\Rightarrow\) Time period of rotation, i.e., duration of the day,
\(=\frac{2 \pi}{\omega}=2 \pi \sqrt{\frac{R}{g}}=1.41 \,hr\)
($G$ ગુરુત્વાકર્ષણનો અચળાંક ; $\mathrm{M}$પૃથ્વીનું દળ)