Segments AB and BC of the assembly are made from 6061-T6 aluminum and A992 steel, respectively. If the allowable shear stress for the aluminum is (Ï„_allow)_al= 12 ksi and for the steel (Ï„_allow)_st= 10 ksi, determine the maximum allowable couple forces P that can be applied to the lever arm. The assembly is fixed at A and C.

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4 ft 2.5 ft /2.5 ft ft 4 in. 4 in.