An arm ABC lying in a horizontal plane and supported at A (see figure) is made of two identical solid steel bars AB and BC welded together at a right angle. Each bar is 22 in. long.

(a) Knowing that the maximum tensile stress (principal stress) at the top of the bar at support A due solely to the weights of the bars is 1025 psi, determine the diameter d of the bars.

(b) If the allowable tensile stress is 1475 psi and each bar has a diameter d = 2.0 in., what is the maximum downward load P that can be applied at C (in addition to self-weight)?

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B A Z C у Х