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Wind Energy

Why does a fl...

Question

Why does a flag fLutter when sting winds are blowing?

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Solution

When the wind is not flowing strongly, the flow lines in the air are relatively staright. This is called laminar flow. As the wind speed increases it reaches a threshold beyond which laminar flow becomes turbulent. Vortices (like a stirred fluid like whirlpools and smoke rings) in the turbulent flow of air makes the flag to flap.

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