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Groups > sci.physics > #648949
| From | jimp@specsol.spam.sux.com |
|---|---|
| Newsgroups | sci.physics |
| Subject | Re: Hourglass Question |
| Date | 2017-09-06 19:26 +0000 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <rou58e-gge.ln1@mail.specsol.com> (permalink) |
| References | <59ADBEA8.5404@mindspring.com> <59B040CE.429@mindspring.com> |
Ron Hardin <rhhardin@mindspring.com> wrote: > Ron Hardin wrote: >> >> An old question from the 1970s that I never >> figured out. >> >> What governs the speed of flow of an hourglass? >> >> I mean what principle. What's going on. >> >> It's not viscosity (no transport of x momentum in >> the y direction etc.) >> >> It seems like it's the time it takes something to >> call out of a lockup condition and clear the mess, >> leaving it up to the next lockup condition, but >> what the hell equation is that? > > > Try this start: the sand above the hole consists of locked up unstable structures, each > stabilized by the structure below it. > > The one at the bottom goes unstable and falls, freeing the one above to begin going > unstable. > > So there a distance between structures, an instability growth time to collapse. Nope. -- Jim Pennino
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Hourglass Question Ron Hardin <rhhardin@mindspring.com> - 2017-09-04 16:59 -0400
Re: Hourglass Question Serg io <invalid@invalid.com> - 2017-09-04 17:53 -0500
Re: Hourglass Question Double-A <double-a3@hush.com> - 2017-09-05 13:44 -0700
Re: Hourglass Question benj <benj@nobody.net> - 2017-09-05 19:34 -0400
Re: Hourglass Question "reber G=emc^2" <herbertglazier0@gmail.com> - 2017-09-06 14:22 -0700
Re: Hourglass Question benj <benj@nobody.net> - 2017-09-06 18:21 -0400
Re: Hourglass Question Serg io <invalid@invalid.com> - 2017-09-06 18:18 -0500
Re: Hourglass Question hanson <hanson@quick.net> - 2017-09-06 15:35 -0700
Re: Hourglass Question Double-A <double-a3@hush.com> - 2017-09-07 13:06 -0700
Re: Hourglass Question Serg io <invalid@invalid.com> - 2017-09-07 16:44 -0500
Re: Hourglass Question Double-A <double-a3@hush.com> - 2017-09-08 13:34 -0700
Re: Hourglass Question "reber G=emc^2" <herbertglazier0@gmail.com> - 2017-09-08 15:53 -0700
Re: Hourglass Question "hanson" <hanson@quick.net> - 2017-09-08 17:36 -0700
Re: Hourglass Question Double-A <double-a3@hush.com> - 2017-09-11 14:41 -0700
Re: Hourglass Question "reber G=emc^2" <herbertglazier0@gmail.com> - 2017-09-09 13:31 -0700
Re: Hourglass Question "hanson" <hanson@quick.net> - 2017-09-09 14:32 -0700
Re: Hourglass Question Ron Hardin <rhhardin@mindspring.com> - 2017-09-06 14:39 -0400
Re: Hourglass Question Serg io <invalid@invalid.com> - 2017-09-06 14:01 -0500
Re: Hourglass Question Ron Hardin <rhhardin@mindspring.com> - 2017-09-06 18:36 -0400
Re: Hourglass Question jimp@specsol.spam.sux.com - 2017-09-06 19:26 +0000
Re: Hourglass Question "reber G=emc^2" <herbertglazier0@gmail.com> - 2017-09-06 14:35 -0700
Re: Hourglass Question Edward Prochak <edprochak@gmail.com> - 2017-09-06 15:32 -0700
Re: Hourglass Question hanson <hanson@quick.net> - 2017-09-06 15:44 -0700
Re: Hourglass Question "nuny@bid.nes" <alien8752@gmail.com> - 2017-09-06 15:50 -0700
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