Nieminen Juha wrote:

> : You can now see that the windmill turns from the heat of the sunlight! The
> : black sides absorb much more energy (pressure from the light) and the mill
> : starts turning.
> 
>   You said it right: from the _heat_ of the sunlight.
>   Of course the electromagnetic waves carry energy. I have never said
> anything else. You can convert this energy to anything. You can boil water
> with sunlight and make a steam engine run. You can use solar panels to
> generate electricity and run a car if you want.
>   But that's not due to the mass of the light.
>   I have read about the solar windmill, and the reason for it to move is
> not the mass of the light, but the heat caused by the energy it carries.
> Even the theoretical amount of mass of the light would not be enough to
> move an object because it's so small.

See also the off topic group for an continuation of this thread.

-- 
Ken Tyler
1100+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html

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