A stepped steel shaft ABC has lengths AB = L1 = 1.0 m and BC = L2 = 1.27 m, with diameters d1 = 25.4 mm and d2 = 19.05 mm, respectively. The steel has a yield stress Y = 450 MPa and shear modulus G = 77 GPa. A twisting moment is applied at the stepped section B. Ends A and C are fixed.
a. Determine the value of T that first causes yielding.
b. For this value of T, determine the angle of rotation ψB at section B.
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