[ale] HELP!!! /HDA DISASTER!

[James P. Kinney III]

But since the space containing the spinning drive is not air, but an
inert gas like helium to eliminate contamination and friction, the speed
of sound will be much higher.

c=(B/p)^(1/2)  where c is velocity, B is bulk modulus and p is density.

Since a helium atmosphere is about the same B value as air, but the
density is much lower the speed of sound in helium, at 20 degree C, is
1km/s, or 621 miles/ssecond or 37,260 mph!

On Tue, 2002-01-29 at 09:08, Jim Lynch wrote:
> Let's see.  3.14 * 3.5 = 10.99 inches of travel per rotation
> 10.99 * 72000 = 791280 inches per minute
> There are 5280 * 12 = 63360 inches per mile, that give us
> 791280 / 63360 = 12.48 miles per minute
> 12.48 * 60 = 749 miles per hour.  
> 
> What's the speed of sound?  That's thing is dangerously close to mach
> 1.  
> 
> 8)
> 
> Jim.
> 
> jeff hubbs wrote:
> > 
> > Charles Marcus wrote:
> > 
> > > Wow!!!
> > >
> > > A 72,000 rpm drive!!!
> > >
> > > I want one of those!!!
> > 
> > You can KEEP it!  I wouldn't want to be in the same room with the darn
> > thing!
> > 
> > - Jeff
> > 
> > ---
> > This message has been sent through the ALE general discussion list.
> > See http://www.ale.org/mailing-lists.shtml for more info. Problems should be
> > sent to listmaster at ale dot org.
> 
> ---
> This message has been sent through the ALE general discussion list.
> See http://www.ale.org/mailing-lists.shtml for more info. Problems should be 
> sent to listmaster at ale dot org.
-- 
James P. Kinney III   \Changing the mobile computing world/
President and COO      \          one Linux user         /
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GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
<jkinney at localnetsolutions.com>
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