A flexible rotor-shaft system comprises a 10 kg rotor disc placed in the middle of a massless shaftof diameter 30 mm and length 500 mm betweenbearings (shaft is being taken mass-less as theequivalent mass of the shaft is included in therotor mass) mounted at the ends. The bearings areassumed to simulate simply supported boundaryconditions. The shaft is made of steel for whichthe value of E is 2.1 x 1011 Pa. What is the criticalspeed of rotation of the shaft?

A flexible rotor-shaft system comprises a 10 kg rotor disc placed in

1.	A flexible rotor-shaft system comprises a 10 kg rotor disc placed in the middle of a massless shaftof diameter 30 mm and length 500 mm betweenbearings (shaft is being taken mass-less as theequivalent mass of the shaft is included in therotor mass) mounted at the ends. The bearings areassumed to simulate simply supported boundaryconditions. The shaft is made of steel for whichthe value of E is 2.1 x 1011 Pa. What is the criticalspeed of rotation of the shaft?
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