A 12-ft beam AB that weighs W, 180 lb supports an air conditioner that weighs W, = 1000 16. The beam, in turn, is supported by hanger rods (1) and (2). as shown in Fig. P3.3-10. (a) If the diameter of rod (1) is in., what is the stress, o, in the rod? (b) If the stress in rod (2) is to be the same as the stress in rod (1). what should the diameter of rod (2) be (to the nearest in.)? (c) If the two support rods are sized as determined in Part (b). their lengths are L L; 6 ft, and they are made of steel with E 30 x 10' ksi, what will be the downward displacements u and us of the ends of the beam?