In critically damped free vibration of SDF system, why Ccr=2mWn ?

Classical Dynamics of Particles and Systems
5th Edition
ISBN:9780534408961
Author:Stephen T. Thornton, Jerry B. Marion
Publisher:Stephen T. Thornton, Jerry B. Marion
Chapter3: Oscillations
Section: Chapter Questions
Problem 3.18P: Show that, if a driven oscillator is only lightly damped and driven near resonance, the Q of the...
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In critically damped free vibration of SDF system,

why Ccr=2mWn ?

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