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A rotor has a mass of 225 kg and has a radius of gyration of 400 mm. It is bolted between the ends of

A rotor has a mass of 225 kg and has a radius of gyration of 400 mm. It is bolted between the ends of two shafts one of which is 75 mm diameter, 0.9 m long and the other is 65 mm diameter, 0.45 m long. The other ends of the shafts are rigidly fixed in position. Find the frequency of the natural torsional vibrations of the system.

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