A spherical pressure vessel has an inside diameter of 6 m and a wall thickness of 15 mm. The vessel will be constructed from steel [E = 200 GPa; ν = 0.29] that has a yield strength of 340 MPa. If the internal pressure in the vessel is 1,750 kPa, determine (a) the normal stress in the vessel wall, (b) the factor of safety with respect to the yield strength, (c) the normal strain in the sphere, and (d) the increase in the outside diameter of the vessel.