Re: [Phys-l] decibels

[chuck britton <cvbritton@mac.com>]

But not what I would expect from a vacuum cleaner - in spite of what 
the ads might imply.

At 12:53 PM -0700 8/29/11, Bernard Cleyet wrote:
> On 2011, Aug 29, , at 12:30, chuck britton wrote:
>
> >  One possible way for a device to output more power than it takes in
> >  would be for it to be extracting thermal E from its environment.  ;-)
>
>
> Oh!
>
> bc thinks a coefficient of performance > 1.
>
> http://en.wikipedia.org/wiki/Thermal_efficiency
>
> bc
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