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? Clearswift monitors, controls and protects all its messaging traffic in compliance with its corporate email policy using Clearswift products. Find out more about Clearswift, its solutions and services at http://www.clearswift.com This communication is confidential and may contain privileged information intended solely for the named addressee(s). It may not be used or disclosed except for the purpose for which it has been sent. If you are not the intended recipient, you must not copy, distribute or take any action in reliance on it. Unless expressly stated, opinions in this message are those of the individual sender and not of Clearswift. If you have received this communication in error, please notify Clearswift by emailing [EMAIL PROTECTED] quoting the sender and delete the message and any attached documents. Clearswift accepts no liability or responsibility for any onward transmission or use of emails and attachments having left the Clearswift domain. This footnote confirms that this email message has been swept by MIMEsweeper for Content Security threats, including computer viruses. _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
