At a point in a stressed body, the Cartesian components of stress are a, = 40MPa, = 60 MPa,a, = 40 MPa, Txy = 80 MPa, t= 50 MPa, t., 60 MPa, Determine (a) the normal and shear stresses on a plane whose outer normal has the direction cosines a,, = 4/9,a., = 4/9,a3, 7/9 and the angle between the resultant stress » and the outer to the plane.