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Old 12th September 2006, 01:52 PM   #164
Arkan_Wolfshade
Philosopher
 
Join Date: Jan 2006
Posts: 7,154
Originally Posted by TruthSeeker1234 View Post
I agree. The 9 second figure is NIST, not me.
Quote:
At 9:58:59, the South Tower collapsed in ten seconds,
source No estimated stated for North Tower.

http://www.google.com/url?sa=t&ct=re...4F0RvDFt5J23xw : No estimates provided for collapse time.

http://www.popularmechanics.com/scie...tml?page=5&c=y 8-10 second estimate, based upon seismic data

http://www.jnani.org/mrking/writings...#_Toc144445996 rebuttal to Jones' collapse time argument

http://www.911myths.com/html/wtc_col...estimates.html collapse time estimates 8-14 seconds

Height of towers Height (ft) 1,368 source

Let's check this, for freefall, in a vacuum we use X=at^2/2 or X= .5*a*t^2 where X=distance, a=9.8 m/s^2 and t=time. http://www.lerc.nasa.gov/WWW/K-12/airplane/mofall.html
X=.5*a*t^2
X=.5*9.8*t^2
X=4.9*t^2
0 seconds => X=0
1 seconds => X=4.9m
2 seconds => X=19.6m
3 seconds => X=44.1m
4 seconds => X=78.4m
5 seconds => X=122.5m
6 seconds => X=176.4m
7 seconds => X=240.1m
8 seconds => X=313.6m
9 seconds => X=396.9m = 1028.87139 feet
9.25 seconds => X=419.25625m = 1375.51263 feet
9.5 seconds => X=442.225m = 1450.86942 feet
10 seconds => X=490.0m = 1607.61155 feet

Now, please cite exactly where NIST said it fell in exactly 9 seconds.
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