Consider a rotor on a massless and rigid shaft, which is supported by ball bearings at the

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Consider a rotor on a massless and rigid shaft, which is supported by ball bearings at the ends (Figure P2.5).

Figure P2.5 

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The mass of the rotor is \(10 \mathrm{~kg}\) and the eccentricity is \(0.5 \mathrm{~cm}\). If the operating speed of the rotor is \(4,200 \mathrm{rpm}\), what should be the stiffnesses of the bearings such that the amplitude of rotor vibration does not exceed \(0.05 \mathrm{~cm}\) ?

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