The structure in the figure is composed of two rigid bars (AB and CD) and two vertical rods made of aluminum and steel. All connections are pin joints. Determine the maximum force P that can be applied to the structure if the vertical displacement of its point of application is limited to 6 mm. Neglect the weights of the members A O) O) 3 m 2m Aluminum A = 300 mm E = 70 GPa P 3 m 2m B D Steel A = 500 mm E = 200 GPa