Re: permanent magnet motor

In sci.physics, Sam Wormley
<swormley1@xxxxxxxxx>
wrote
on Sun, 18 Feb 2007 03:28:35 GMT
<DJPBh.1308$PD2.1188@attbi_s22>:
gdewilde@xxxxxxxxx wrote:


If you think it can[']t work, then you are kindly requested to explain
why.



There is a reason perpetual motion machines can't work. Learn
thermodynamics...


Pedant Point:

Erm...no. That's not the reason PPMs don't work.
Thermo is a model of the Universe.

It's a darned *good* model, to be sure...but it doesn't
explain why PPMs can't work. As phrased, he asked why
we think it can't work; thermodynamics is in that case a
perfectly good answer. But one could also say "we think
satellites can't work because the Earth is flat".

Fortunately, we know the Earth is an oblate spheroid
(and satellites have helped determine its oblateness).
We also have quite a bit of evidence that the theory of
thermodynamics works.

But it doesn't really explain why.

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