A cast iron water main pipe \(12 \mathrm{~m}\) long, \(500 \mathrm{~mm}\) inside diameter and \(25 \mathrm{~mm}\) wall thickness runs full of water. It is supported at its ends. If the density of cast iron and water are 7200 \(\mathrm{kg} / \mathrm{m}^{3}\) and \(1000 \mathrm{~kg} / \mathrm{m}^{3}\) respectively, calculate the maximum stress induced in cast iron.