The spherical gas tank is fabricated by bolting together two hemispherical thin shells of thickness \(30 \mathrm{~mm}\). If the gas contained in the tank is under a pressure of \(2 \mathrm{MPa}\), determine the normal stress developed in the wall of the tank and in each of the bolts.The tank has an inner diameter of \(8 \mathrm{~m}\) and is sealed with 900 bolts each \(25 \mathrm{~mm}\) in diameter.