A beam has the extruded cross section shown below, where t-20 mm. 5t 2t t'2t % Matlab input: t-20; Mz-1793; Find y, i.e., the signed distance from the z'-axis to the z-axis, where z is the centroidal axis of the cross section. Determine the moment of inertia I with respect to the centroidal axis z. 6 x10° mm'4 Determine the absolute value of the maximum tensile normal stress σ when the cross-section is subject to the moment M2- 1793 N. m MPa