A cylinder with hemispherical ends failed. Its overall length was 4m with an inner diameter of 0.75 m. Its outer diameter was 0.77 m. The cylinder was made from carbon steel. Its ultimate tensile strength was 410 MPa, its yield strength was 220MPa, and its modulus of elasticity was 125 GPa. During design, a factor of safety of5 was used. What pressure caused the failure?

Fig: 1