From: Emlyn O'regan (oregan.emlyn@healthsolve.com.au)
Date: Mon Oct 28 2002 - 20:52:35 MST
Hmm... how could they have the same sound? Surely the one with a hollow
center would vibrate slightly differently. I reckon if you could suspend
both spheres from wires and dong them with something, and record the sound,
you'd get a significant difference. I don't know how to tell which is which
from that, but I'll bet that someone with good enough knowledge of the
physics of sound could.
To have identical dimensions *and* mass *and* only one with a hollow center,
they must have different densities. Can we assume that they must then be
made of different materials? Surely this is detectable using some kind of
scanning technology?
Actually, scanning might be your best bet in general. Nothing in the
original problem said that the spheres were hard enough to roll - maybe they
are made of wet sponge? Or maybe they are extremely sticky? If so, you could
stick each one to another heavy ball and spin the combination in air; they
should spin differently if the attached balls are identical to each other.
Emlyn
> -----Original Message-----
> From: scerir [mailto:scerir@libero.it]
> Sent: Saturday, 26 October 2002 16:59
> To: extropians@extropy.org
> Subject: the 'duck me!' game
>
>
> [playing with the identity problem ...]
>
> You have two spheres of identical dimension, mass,
> colour, surface, sound, fragrance, etc. etc.
>
> One is solid throughout, with a uniform mass distribution,
> while the other has a hollow center.
>
> Is it possible to determine (in a non destructive
> manner!)which is which? How?
>
>
>
>
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