Slime wrote:
>
> > #declare V = 0.9*V;
>
> This is physically accurate.
>
> > #declare V = pow(V, 0.9);
>
> This is not.
>
In fact neither of them is.
In the general case the force generated by air resistance is a quite
complicated function of the speed. At low speeds it can be approximated
by a force proportional to the speed (the first of the cited formulas).
Christoph
--
POV-Ray tutorials, IsoWood include,
TransSkin and more: http://www.tu-bs.de/~y0013390/
Last updated 13 Aug. 2002 _____./\/^>_*_<^\/\.______
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