## Mechanics of Materials, 7th Edition

average stress = (4 + 8)/2 = 6 ksi R =$\sqrt 2^{2} + 3^{2}$ = 3.61 ksi maximum stress = 6 + 3.61 = 9.61 ksi minimum stress = 6 - 3.61 = 2.39 ksi maximum shear = $|9.61 - 2.39|$/2 = 3.61 ksi