(A) Draw Mohr's circle representing the state of plane stress for a spherical pressure vessel of radius r and wall thickness t, which enclosed a pressurized fluid of pressure, P. (B) Draw Mohr's circle representing the state of plane stress for a cylindrical pressure vessel of radius r and wall thickness t, which enclosed a pressurized fluid of pressure, P. (C) What is the maximum shear stress in the spherical pressure vessel? (D) What is the maximum shear stress in the cylindrical pressure vessel?