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Define critical speed and whirling speed. An instrument vibrates with a frequency of 1.55 Hz when there is no damping and 1.2 Hz when

Define critical speed and whirling speed. An instrument vibrates with a frequency of 1.55 Hz when there is no damping and 1.2 Hz when damping. Find 1. the damping factor, and 2. logarithmic decrement.

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