Draw the shear and moment diagrams for the shaft, and determine its required diameter to the nearest \(\frac{1}{8}\) in. if \(\sigma_{\text {allow }}=30 \mathrm{ksi}\) and \(\tau_{\text {allow }}=15 \mathrm{ksi}\). The journal bearings at \(A\) and \(C\) exert only vertical reactions on the shaft. Take \(P=6\) kip.

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A -2 ft -1 ft -1 ft- B C D P 3 kip