(a)[3]
Fig. 2.1 shows a liquid in a cylindrical container. The container has cross-sectional area $A$. The liquid column has height $h$ and the liquid density is $\rho$. Show that the pressure $p$ exerted by the liquid on the cylinder base is $p = \rho g h$.
(b(i))[1]
Explain why the graph line in Fig. 2.2 does not go through the origin $(0,0)$.
(b(ii))[2]
Use the information in Fig. 2.2 to calculate the density of the liquid in the cylinder.