Force due to imbalance increases as the square of the speed increases. A 1 vibration at running

Question:

Force due to imbalance increases as the square of the speed increases. A 1× vibration at running speed on a fan is 1 inch/s velocity peak. The vibration of the 1× component at 50% of speed is 0.02 inch/s. Is the problem at running speed due to imbalance?

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