Date: Tue, 30 Jan 2001 03:03:40 -0800 (PST) From: thomas@hentschel.net To: Peter Wemm <peter@netplex.com.au> Cc: Mark Huizer <freebsd@dohd.org>, freebsd-hackers@FreeBSD.ORG Subject: Re: Clustering FreeBSD Message-ID: <200101301103.f0UB3f144218@falcon.home.hentschel.net> In-Reply-To: <200101301026.f0UAQJ463985@mobile.wemm.org>
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On 30 Jan, Peter Wemm wrote: > Mark Huizer wrote: >> > | >> > | Doh! I mean 9.8 m/s/s, of course. >> > >> > That's acceleration not velocity :-) >> > >> > The terminal velocity of a PC case is probably a lot lower than the >> > velocity of an outer edge of a 10000 RPM drive. >> > >> What am I doing wrong? Given a diameter of appr. 7cm, I'd come at appr >> 0.7Mach. Does that mean that within a few years my machine will go >> KABOOM when booting? > > I have a 15K rpm drive if you want to do a recalculation. I think that > is 1.05Mach, depending on whether you rounded or not. ;-) > Hang on, there's a bug here somewhere: 7cm = .07m, .07m x 3.14... = .22m (per rotation) .22m *15000/60 = 55m/s or ~ 195km/h or 123 mph, not even close to a fast car. We should expect breaking the sound barrier with >75krpm drives (depending on your altitude and air pressure) -Th To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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