4. Consider an aluminum single crystal under a stress state, x = 250 psi, y = 50 psi, z = Tyz = Tzx = Txy = 0, where x = [100], y = [010], and z = [001]. A. What is the resolved shear stress, Tnd, on the (111) plane in the [110] direction (i.e., with n = [111], d =[110])? B. What is the resolved shear stress on the (111) plane in the [101] direction?