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Funny Debate

JustCallMeTarzan
Posts: 1,922
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8/17/2009 2:51:23 PM
Posted: 7 years ago
So I was sticking my finger in a processor fan at work and thought up this funny debate:

Resolution: The inner area and outer area of a fan blade move at the same speed when the fan is in motion.

Argument:

Measured in mph with a standard r*t=d calculation, the relative parts do not move at the same speed. BUT, measured in some other standard, they DO. For example, since points on the inner and outer areas of a fan are in a linear relation to each other, they travel at the same speed measured in degrees per second, thus fulfilling the resolution.
Chuckles
Posts: 274
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8/17/2009 3:51:40 PM
Posted: 7 years ago
interesting idea. I'm no rocket surgeon, but is it called centripetal force when the outer point has to move faster than the inner point?
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Floid
Posts: 751
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8/18/2009 5:17:36 AM
Posted: 7 years ago
Well, you are right. In physics such a problem is solved using the idea angular velocity which measures the velocity in degrees or radians per second. So in your example, all points on the fan blade have equal angular velocity. Using this technique simplifies the measurement and calculation of angular momentum, centripital force, etc.

So it isn't really debatable that there is a frame of reference for measuring the velocity around a fixed axis which all points on a radial line of circular motion have equal velocity in that frame of reference.
JustCallMeTarzan
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8/18/2009 6:13:56 PM
Posted: 7 years ago
Right to all above... but if you successfully argue that traversing a set number of degrees is a "distance" - as in, if I cover 30 degrees relative that lamp 3 meters away - then you can make a relative sort of rt=d calculation.... I dunno - it was just a funny little thought.
leet4A1
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8/18/2009 6:36:31 PM
Posted: 7 years ago
At 8/18/2009 11:23:22 AM, Harlan wrote:
But speed is a measurement of time and distance, right? Not time and degrees, or how ever you would phrase it.

What about angular velocity? That is radians/second.
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