What term describes the rotational speed at which an object begins to vibrate as it turns?

Name: What term describes the rotational speed at which an object begins to vibrate as it turns?
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The term that describes the rotational speed at which an object begins to vibrate as it turns is referred to as the critical speed. At the critical speed, the centrifugal force acting on elements of the object equals the elastic force holding them together, causing resonance and vibration.

What Term Describes the Rotational Speed at Which an Object