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Posted by on Thursday, April 9, 2009 at 3:36pm.

Why does a narrow strip of paper, attatched to a vent that is blowing air at a steady rate, wave and flap? I havn't taken physics yet but I would like to know the answer this question.

  • physics - , Thursday, April 9, 2009 at 4:30pm

    If it were truly steady, without any "pulses" of pressure, it wouldn't flap. However, fans don't blow at a steady rate, they pump air with blades.

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