An engineering component is made of 7075-T6 aluminum that has 469 MPa in yield strength. If this component is subjected to the following state of stress, determine the safety factor against yielding by the maximum shear stress criterion. s(sigma)x = 100, s(sigma)y = 140, s(sigma)z = -60, txy = 80, tyz = 0, tzx = 0 (MPa).