The internal loadings at a cross section through the 6-in. diameter drive shaft of a turbine consist of an axial force of 2500 lb, a bending moment of 800 lb · ft, and a torsional moment of 1500 lb · ft. Determine the principal stresses at point A. Also calculate the maximum in-plane shear stress at this point.

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3 in. 2500 lb 800 lb-ft 1500 lb-ft