tsig
a carbon based life-form
- Joined
- Nov 25, 2005
- Messages
- 39,049
I am a concerned citizen.
Like you, I believed the Official Conspiracy Theory about 19 nut-jobs getting by our military and flying a plane into their headquarters until I saw this:
http://www.youtube.com/watch?v=ixwx19t2IMQ
By the time WTC 7 went out of sight I knew it was a CD. This is an easy call. It fell straight down without distorting. As it turns out, it fell at FFA [free fall acceleration] for ~100 feet. As a physicist you should understand the significance. For a building to fall at FFA, all the supporting structure must be removed. Bending columns provide resistance and prohibit FFA.
That's why I asked how far you assumed the top portion fell at FFA. There were 38 core columns and about 120 exterior columns that would have to be simultaneously removed for the top section to fall at FFA.
As Dr. Sunder said:
[FONT="]"a free fall time would be an object that has no structural components below it . . . there was structural resistance that was provided in this particular case. And you had a sequence of structural failures that had to take place. Everything was not instantaneous."
[/FONT]Their computer model bares this out. The moment frames [a steel belt every other floor] hold the exterior columns together. The exterior frame is folding up, providing resistance and prohibiting FFA. [FONT="]
[qimg]http://a.imageshack.us/img830/7267/nistwtc7modelvideo14s16.jpg[/qimg]
[/FONT]
Amazing! You just looked at it and formed your conclusion, no math or analysis needed but only your non-trained eyeball.