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Warp wrote:
>
> Francois Labreque <fla### [at] videotron ca> wrote:
> : It's got nothing to do with wind resistence per se, but with the uneven
> : density of the object.
>
> The density of the object can be constant thorough its volume, but the
> shape of the object can affect the air resistance so that it makes the
> object rotate.
> A windmill can have a constant density. It rotates. :)
Yes, but that's not what you said. you said "(for example if the
density of the object is
not constant along its volume)".
--
Francois Labreque | //\\ Wear an ASCII ribbon!
flabreque | || ||
@ | \\// Support the campain
videotron.ca \\ against HTML e-mail
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Francois Labreque <fla### [at] videotronca> wrote:
: Yes, but that's not what you said. you said "(for example if the
: density of the object is
: not constant along its volume)".
It was one example where the force of the air resistance is not constant.
There are other examples as well.
--
char*i="b[7FK@`3NB6>B:b3O6>:B:b3O6><`3:;8:6f733:>::b?7B>:>^B>C73;S1";
main(_,c,m){for(m=32;c=*i++-49;c&m?puts(""):m)for(_=(
c/4)&7;putchar(m),_--?m:(_=(1<<(c&3))-1,(m^=3)&3););} /*- Warp -*/
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I believe the more precise concept is "specific surface area," defined in units
like m^2/g.
CASE ONE: dumbells with one sphere made of W (19 g/cc), the other of Al (3?
g/cc).
Of course the wind is going to push the less dense sphere more than the other.
Either description (uneven density or uneven specific surface area) are equally
good at predicting this effect.
CASE TWO: dumbells made of tungsten, one end is a sphere, the other end is a
mace with long spikes; each end's mass is equal.
Of course the wind is going to push the higher surface area end more than the
other.
Here, the superiority of the term "specific surface area" over "density" wins
out.
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