Posted by Ann on Tuesday, January 11, 2011 at 11:34pm.
The tip travels 2*pi*0.25*20 meters (in a circle) in 60 seconds.
That is a tangential speed of 0.524 m/s
Are you sure the rotation rate is only 20 rpm? That is VERY slow for a fan.
20 rev/second is more likely for a ventialation fan.
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