Date: Tue, 27 Sep 2005 14:20:22 -0400

Author: sampere

Subject: Re: Concave Glass for Bouncing Ball Bearing


Now you're really getting me going! Sound in a 200 mTorr vaccuum...
Yeah, that's it. That's why is stops - it's the sound carrying away all
the energy! Take away that mechanism and it should go forever, huh?

Hey Clif, I just did the light bulb and diffraction grating experiment.
And it worked just like it's supposed to ;). Oh, and I have everybody
terrified of radiation now. Everyone in Syracuse is now wearing lead
underwear! The chaffing is terrible, but at least we're protected.

Thanks for the light hearted 'conversation' on such a hectic day. Makes
the day go faster, but I really want it to slow down so I can get all my
stuff done.


Cliff Bettis wrote:

> Vacek,
> I hope Sam doesn't see this; you know how sensitive he is about these
> matters. I also had in mind using the same glass for my Euler's disk
> and putting it in a vacuum too. Without the "sound" it ought to spoll
> a bit longer.
> Cliff
> ----- Original Message ----- From: "Vacek Miglus"
> To:
> Sent: Tuesday, September 27, 2005 11:27 AM
> Subject: Re: Concave Glass for Bouncing Ball Bearing
>> At 08:50 AM 9/27/2005, you wrote:
>>> The curvature is to keep the ball on the glass after repeated
>>> bounces. It will bounce an amazing number of times if you do it in a
>>> vacuum with a hardened ball bearing. You need a fairly massive piece
>>> of glass for good elastic collisions.
>> Cliff,
>> But how can you hear it in a vacuum? That's the coolest part, hearing
>> the ball going faster and faster toward the end.
>> Or do you put a microphone in the bell jar? :-)
>> Vacek
From Tue Sep 27 14:39:16 2005