A spherical tank of diameter 48 in. and wall thickness 1.75 in. contains compressed air at a

Question:

A spherical tank of diameter 48 in. and wall thickness 1.75 in. contains compressed air at a pressure of 2200 psi. The tank is constructed of two hemispheres joined by a welded seam (see figure).
(a) What is the tensile load f (lb per in. of length of weld) carried by the weld?
(b) What is the maximum shear stress tmax in the wall of the tank?
(c) What is the maximum normal strain in the wall? (For steel, assume
E = 30 ( 106 psi and v = 0.29.)