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The rotor of a turbine 13.6 kg in mass is supported at the midspan of a shaft with bearings 0.4064 m apart, as shown in Figure. The rotor is known to have an unbalance of 0.2879 kg . cm.

Determine the forces exerted on the bearings at a speed of 6000 rpm if the diameter of the steel shaft is 2.54 cm.

Compare this result with that of the same rotor mounted on a steel shaft of diameter l.905 cm. (Assume the shaft to be simply supported at the bearings.)

123_The rotor.jpg

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