*9-56. The steel and aluminum plate assembly is bolted together and fastened to the wall. Each plate has a constant width in the z direction of 200 mm and thickness of 20 mm, If the density of A and B is ps Ps Pal 7.85 Mg/m, and for C, 2.71 Mg/m, determine the location of the center of = mass. Neglect the size of the bolts. y A B 300 mm = 100 mm 200 mm- Prob. 9-56 C 50