A single crystal of a metal is oriented for a tensile test such that its slip plane normal makes an angle of 65.8° 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? O (b) If plastic deformation begins at a tensile stress of 0.952 MPa (138.1 psi), determine the critical resolved shear stress for this metal. i MPa

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