Q. 10.8

A flywheel of mass 18 kg and radius of gyration 250 mm is mounted at the midpoint of a solid steel shaft of diameter 50 mm and length, L. The shaft rotates in the bearings A and B at its ends with an angular speed of 120 rpm. If both the bearings suddenly freeze so that the ends of the shaft become locked, the shaft will have to absorb the kinetic energy of the flywheel. Calculate the minimum length L of the shaft for which this can be done without exceeding a maximum shear stress $\tau_{\max }=80$ MPa. Assume modulus of rigidity, G = 82 GPa.

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