Find the equivalent torsional spring constant of the system shown in Fig. 1.70. Assume that \(k_{1}, k_{2}, k_{3}\), and \(k_{4}\) are torsional and \(k_{5}\) and \(k_{6}\) are linear spring constants.

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+00000 ks R ka k3 k 00000 K K FIGURE 1.70 A combination of torsional and linear springs.