Calculate the equivalent torsional spring constant for the stepped shaft shown in Figure 2.40. The two shafts have negligible mass and are made of a material with shear modulus \(G_{1}\) and \(G_{2}\), respectively. At the end of the shaft is a rigid disk of mass inertia \(I_{G}\). Express your answers in terms of known quantities.

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d d 16 Figure 2.40: Stepped shaft.