A single crystal of a metal is oriented for a tensile test such that its slip plane normal makes an angle of 64.5 with the tensile axis. Three possible slip directions make angles of 30,48, and 78 with the same tensile axis. (a) Which of these three slip directions is most favored? 0 (b) If plastic deformation begins at a tensile stress of 1.26MPa (182.8 psi), determine the critical resolved shear stress for this metal. MPa