80 lines
3.4 KiB
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80 lines
3.4 KiB
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From fork-admin@xent.com Tue Sep 10 11:07:16 2002
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From: Ned Jackson Lovely <fork@qu.to>
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To: fork@example.com
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Subject: Re: The Big Jump
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Message-Id: <20020910004617.GB1045@ibu.internal.qu.to>
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References: <15861948735.20020908113611@magnesium.net>
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<002201c2582a$e84211f0$0200a8c0@JMHALL>
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Date: Mon, 9 Sep 2002 20:46:17 -0400
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On Mon, Sep 09, 2002 at 11:01:22AM -0700, John Hall wrote:
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> Why so fast? Normal terminal velocity is much slower.
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Terminal velocity can be calculated by $v_{T} = \sqrt{\frac{2mg}{CpA}}$
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where C is an experimentally determined coefficient, p is the density of the
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air, and A is the area of the object. These calculations only work if the
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object is blunt and the airflow is turbulent, blah blah blah. Terminal velocity
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for a skydiver actually varies with how the diver holds themselves -- you go
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faster if you pull yourself into a cannonball. That is the "A", for the
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most part.
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All else being equal, the terminal velocity is inversely proportional to the
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square root of air density. Air density drops off pretty quickly, and I
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really should be doing something other than digging up the math for that. I
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think it involves calculus to integrate the amount of mass as the column of
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the atmosphere trails off. I grabbed the other stuff directly out of a book :).
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In '87 a guy named Gregory Robertson noticed a fellow parachutist Debbie
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Williams had been knocked unconscious. He shifted so that he was head down,
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hit about 200 mi/h, and caught up with her and pulled her chute with 10 seconds
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to spare.
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--
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njl
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