For practice 2.- A steel beam with the cross-section shown in the figure, where the centroid location = 0.644 in, is supported by a roller at A and a pin at B and carries the loads shown. Calculate the moment of inertia of the cross-section about its centroidal axis and use it to find the maximum absolute value of the bending stress at a weak section one 1" to the left of point D where Ofail 42,000 psi. How much is the safety factor? Where does the maximum absolute value of the bending stress occur in this cross-section? Is it tension or compression? B 1.6" C D E 20 in. -20 in. 20 in. -20 in. 500 lb 300 lb 500 lb 2" V 2" Hint: take advantage of symmetry to obtain the support reactions and keep in mind that you are being told the section where you need to check for the stresses.