Re: The Energy Square.

On Wed, 18 Jan 2006, Spaceman wrote:

> "Timo Nieminen" <uqtniemi@xxxxxxxxxxxxxxxxx> wrote:
> | A water wave is a disturbance in the water. Yes, the water has mass. Does
> | a disturbance have mass?
>
> Yes, or it could not be a disturbance of the mass.

What is the mass of a disturbance? Give a quantitative example, please.

> |A wave in the water can move from A to B, with
> | none of the mass of the water moving from A to B.
>
> Wrong.
> If the mass did not shift some from A to B,
> no wave would be possible at all.

Look at a puddle. Look where the water is. Send a wave from one side to
the other. The wave moves from A to B. When the wave is gone, where is the
water? Still in the original position! The mass of the water hasn't gone
anywhere! The mass of the water moved while the wave was in transit, but
it moved up and down (assuming surface tension ripples, not gravity waves
where the water moves in circles), not from A to B. Energy transport with
no mass transport.

> | I would say that water
> | waves are massless.
>
> They are not.
> they are made of the mass of the water.

What fraction of the mass of the water is the mass of the wave? Does that
mass of the wave move with the wave? Give a quantitative example, please.

--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
.

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