Re: [MLUG - DISCUSSION] Perpetual Motion Machine?

[Stephen Montgomery-Smith <EMAIL:PROTECTED>]

Mike Miller wrote:
> Stephen-- I guess great minds think alike because the structure of your 
> answer was almost identical to mine, but I'm sure you hadn't read mine 
> yet because you wouldn't have bothered to reply.  ;-)  --Mike

I was thinking exactly the same.


> On Fri, 1 Sep 2006, Stephen Montgomery-Smith wrote:
>
> > Michael wrote:
> >
> > > > Is there any energy source we humans use that doesn't come from the 
> > > > sun, at least indirectly?
> > >
> > >
> > > Gravity?
> >
> >
> > Gravity isn't really an energy source.  It is a way of storing energy. 
> > If you lift an object high up, it has more energy than when it is low 
> > down.  (This is called potential energy.)
> >
> > For example, the heat from the sun evaporates water in the sea, and 
> > causes it to rise.  In this way, energy is stored.  Later this water 
> > falls as rain onto mountains, which then releases its energy by going 
> > downhill in rivers.  We can capture this released energy by building 
> > hyodrelectric plants that convert it to electricity (an amazingly 
> > transportable form of energy that even a few hundred years ago must 
> > have seemed impossible).
> >
> > Thus, think of gravity as being a giant rechargable battery, that 
> > stores energy, but is not capable of producing it.
>
>
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--

Stephen Montgomery-Smith
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http://www.math.missouri.edu/~stephen

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