For the following thin sheet (made of a homogeneous, isotropic, linearly elastic material) subjected to the biaxial stress state as shown, compute the radial, circumferential, and shear stresses at the hole for both = 0 and 0 = 90 (8 defined as shown in the picture: zero along the i, axis; positive counterclockwise). Use the following: R = 0.2 in.; a = 40 ksi, df = 30 ksi. Ob Ja i