The external aluminum fuel tank on a hobbyist rocket is subjected to an internal pressure of 500 psi. The end caps are spherical. The cylinder has length of 30 inc., a diameter of 8 in., and a wall thickness of 0.125 in. Determine the stress in the wall at two points A and B. For each, draw the stresses on a 3-D element. Treat the upper cap as spherical vessel and the sidewalls as cylindrical vessel.