Re: [Phys-L] Perpetual Motion Machine, Earth as

[Bill Norwood <bnorwood111@gmail.com>]

Yeah, but somebody had to build it.
Far as I know none of our species built the earth.

On Wed, Apr 1, 2015 at 11:02 PM, brian whatcott <betwys1@sbcglobal.net>
wrote:

> A levitated top in a vacuum chamber is spun up.
>
>  This represents a reasonably persistent rotation....
>
> https://www.youtube.com/watch?v=8nLd5q7UOyE
>
> Brian Whatcott
>
>  * /From/: Bill Norwood <bnorwood111@gmail.com
>    <mailto:bnorwood111%40gmail.com>>
>  * /Date/: Thu, 26 Mar 2015 10:28:47 -0400
>
> ------------------------------------------------------------------------
>
> Might as well open this one up for critique:
>
>
> Earth is a better perpetual motion machine than anything on it could ever
> be, say, relative to a human lifetime.
>
>
> On Wed, Mar 25, 2015 at 7:42 AM, Peter Schoch <pschoch@fandm.edu> wrote:
>
>  So, we've gotten to the point in the semester where the students are
> > finding things on the Internet they want me to explain -- in addition to
> > covering the 'normal' material.
> >
> > One student found this:
> >
> > https://www.youtube.com/watch?v=7KqOwJKWIAw
> >
> > and wants me to explain how this is NOT a perpetual motion machine.
> >
> > I think I can explain the chain one fairly well.  I'm having trouble with
> > the liquid motion one, explaining it in terms of freshman physics.
> >
> > Any suggestions would be welcome.
> >
> > Peter Schoch
>
>
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