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Re: [Phys-l] workable versus unworkable energy



At 04:30 PM 1/9/2007, Jim, you wrote:

[JD]
>We cannot equate (much less define) energy as the ability to do
>work, because that would violate the first or second law of
>thermodynamics.

///

Could some kind soul please explain what John is talking about --
maybe give an example or two.

Jim


In the case of current interest: a car tire can expend an auto's
kinetic energy in heating the tire and heating a patch of blacktop,
and it can expend kinetic energy in shearing a surface layer of rubber.
The energy consumed in the heating side effect is not accessible
for work use.



Brian Whatcott Altus OK Eureka!