$2.[20$p$].$ A cylindrical tank of inside diameter $D_i=2\mathrm{.}75m$ and wall thickness of $6$ mm is filled with water to a height, $h_2=8m.$ The height of the cylinder $(H)$ is $10$ m and the density of the cylinder material $({}_m)$ is $2\mathrm{.}8{10}^{3}k\frac{g}{m^3}.$ Calculate the axial stress, ${}_y$ and the circumferential $($hoop$)$ stress $({}_{})$ at the bottom of cylinder. Hint: water pressure $(\frac{N}{m^2})$

$p={}_{w}hg,g=9\mathrm{.}81\frac{m}{s^2}.{}_w=1,000k\frac{g}{m^3},h(m).$