A narrow tube is sealed onto a tank as shown in Fig. $13-8 .$ The base of the tank has an area of $80 \mathrm{~cm}^{2}$.
(a) Remembering that pressure is determined by the height of the column of liquid, find the force on the bottom of the tank due to oil when the tank and capillary are filled with oil $\left(\rho=0.72 \mathrm{~g} / \mathrm{cm}^{3}\right)$ to the height $\mathrm{h}_{1}$. ( $b$ ) Repeat for an oil height of $\mathrm{h}_{2}$.