$9\ kg$ of mercury is poured into a glass $U-tube$ with inner diameter of $1.2 \ cm$. The mercury can flow without friction within the tube. the oscillation period ......... $\sec$. Density of mercury = $13.6 × 10^3\ kg/m^3$.
Diffcult
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$a=\frac{F_{\text {net }}}{m}=\frac{-2 \rho A g x}{m}=-\omega^{2} x$
$\mathrm{T}=\frac{2 \pi}{\omega}$
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