The compound bar containing steel, bronze, and aluminum segments carries the axial loads shown in the figure. The properties of the segments and the working stresses are listed in the table. A (in.) Steel Bronze Aluminum 0.75 1.00 0.50 E (psi) 30 106 12 x 106 10 x 106 (psi) 20000 18000 12000 P Determine the maximum allowable value of P if the change in length of the entire bar is limited to 0.08 in. and the working stresses are not to be exceeded. Steel 2 ft Bronze 4 ft 3P Aluminum 3 ft 4P FIG. P2.15 2P