full-disclosure - **LosseChange::Debunk it??**

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Date: Wed May 17 16:49:54 2006
From: Pete.Simpson at clearswift.com (Pete Simpson)
Subject: **LosseChange::Debunk it??**

Paul S wrote:

>http://www.pbs.org/wgbh/nova/wtc/dyk.html

>"Each building collapsed in about ten seconds, hitting the ground with
>an estimated speed of about 125 miles per hour."

>"The collapse was a near free-fall. With no restraint, the collapse
>would have taken eight seconds and would have impacted at about 185
>miles per hour."

>My goodness.  Looks like your calculations are wrong.

Which of my calculations are wrong? The time for free fall of any object
'in vacuo' is t = (2h/a)1/2. H = 416m. a = 9.8m/s/s. t = 9.2s. In a
pancake descent t = 110(2h/110a)1/2. According to my calculator that's
just under 90s. So which calculation is incorrect? BTW these
calculations neglect air resistance so are too low. What do you
calculate as the resistance presented by a quarter of a million tonnes
of concrete and steel?

>I'm surprised that you would be so gullible.

Really?

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