A straight rigid beam is hanging from the ceiling by the three suspender bars. The material of bars AB and EF is aluminum and bar CD is made of steel. If each bar has a cross-sectional area of 500 mm2, determine the maximum value of P if: - The allowable stress is (o allow) steel 230 MPa for steel The allowable stress is ( allow) al = 160 MPa for aluminum - Modulus of steel is E st = 200G Pa - Modulus of aluminum is E al = 70GPa B D F al st al 2 m A C E 0.75 m 0.75 m 0.75 m 0.75 m P 2P 13