Problem 4.22

Calculate the period of small oscillations of a hydrometer (Fig. 4.2) which was slightly pushed down in the vertical direction. The mass of the hydrometer is \(m=50 \mathrm{~g}\), the radius of its tube is \(r=3.2 \mathrm{~mm},\) the density of the liquid is \(\rho=1.00 \mathrm{~g} / \mathrm{cm}^{3} .\) The resistance of the liquid is assumed to be negligible.