1. The cylindrical pressure vessel with hemispherical ends has a 5-m diameter and a 20-mm wall thickness. It contains a gas with pressure p = 1 MPa, and the outer wall is subjected to negligible pressure. The yield strength of the material is 150 MPa. "N (a) Determine the maximum normal stress, and indicate its direction. (b) Determine the absolute maximum shear stress. where and on which plane does it occur (explain in words) (c) Determine the factor of safety based on von Mises criteria.