MadSci Network: Neuroscience
Query:

Subject: Why is it that a spinning fan blade forms a dark blade that spins slowly?

Date: Wed Jun 16 19:47:21 1999
Posted by Wong Chun Ming
Grade level: 10-12 School: Ngee Ann Secondary School
City: No city entered. State/Province: No state entered. Country: Sinapore
Area of science: Neuroscience
ID: 929580441.Ns
Message:

When a fan  blade starts to spin, as it spins faster, a dark 
'virtual' blade start to form and spin. As it spins faster, the 
'virtual' blade starts to disappear. As the fan blade spins even 
faster, the 'virtual' blade starts to form again. However, this 
time it spins much slower and in the opposite direction of the 
one formed earlier.




Re: Why is it that a spinning fan blade forms a dark blade that spins slowly?

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