The stresses at a point in plane stress on the body of a car were found to be sigma_xx = 30 MPa (C), sigma_yy = 60 MPa (T) and Tau_xy = 40 Mpausing matrix methods a) determine the normal and shear stresses on a plane passing through the point that is 28 degrees counter-clockwise from the x-axis b) determine the principal stresses and principal direction one c) determine the maximum shear stress at the point