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iSERVEaJEW -> RE: Resistance? What resistance? *shrug* (4/11/2008 1:03:32 AM)
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quote:
ORIGINAL: cow451
The height from which two objects fall is relevant to nothing. Building 7 took at least EIGHT seconds, with some parts hitting the ground in EIGHTEEN seconds, according to seismological data. LINK
There certainly has been much discussion about what caused the seismic readings. I'm looking into this subject, but I haven't come to any conclusions yet. One of the ideas I'm investigating is how those seismic readings support the idea of explosives. If you're interested in seeing a discussion on that, then check out the following:
http://www.abovetopsecret.com/forum/thread318887/pg2
(see "LaBTop posted on 5-12-2007 @ 03:00 PM")
I haven't made my mind up on the seismic readings yet, but that is something I'm looking into.
Now, to the meat of this discussion. WTC7 is measured to have fallen in 6.5 seconds from the SW corner. The measurements are started from the time the building actually begins to fall. What is the point of starting the clock before the building starts to drop?
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Preliminary investigations do not include the mechanics of the actual collapse, concentrating instead on the events leading up to it. The FEMA report begins its "timed collapse sequence" with a seismic event recorded at 5:20:33 pm. FEMA marks this as the time the building "begins to collapse." At this time, the report says, the east and west mechanical penthouses — the structures at the very top of the building — are still intact. Approximately thirty seconds later, FEMA says, video evidence shows the east mechanical penthouse begin to disappear into the building. Five seconds later the west penthouse also disappears, and at 5:21:10 "WTC 7 collapses completely."[39] This is roughly the point at which proponents of the controlled demolition hypothesis begin timing the collapse, noting that the observed times correspond with the free, unimpeded fall of the roofline: just under seven seconds.[5] SOURCE
[5] Jones, Steven E. (2006-09). "Why Indeed Did the World Trade Center Buildings Completely Collapse". Journal of 9/11 Studies 3. Retrieved on 2006-01-13.
[39] FEMA report re WTC7, page 5-23.
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Speed: How fast did the southwest corner of the roof fall? (Students and I measure
[6.5 +- 0.2] seconds for the SW corner of WTC 7, after this corner begins its steady fall.)
Jones, S. (2006, September). Why Indeed Did the WTC Buildings CompletelyCollapse? Journal of 9/11 Studies. p. 4.
The pertinent section of that link you gave reads:
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7 seconds for the north wall to come down.
Even your source acknowledges that the north wall comes down very fast. If their 7 second figure is correct, that would put the speed of the collapse of the north wall just as fast as the apple. Isn't that nice? The north wall falls at the same speed as an apple with only wind resisting its fall. I'm sure that Sir Isaac Newton would agree that it was a controlled demolition.
My source indicates that the time for collapse, measured from when the SW corner began to fall, is 6.5 seconds. The 8 seconds (8.2 according to NIST preliminary report) that you are claiming is based on the observed "kink" in the penthouse that is characteristic of a controlled demolition. Once again, we're measuring from when the building actually begins to fall. When it does, it is very close to free-fall speed in a vacuum (6.0 seconds) and FASTER than a 100g spherically-shaped apple.
Also, the observed acceleration is consistent with the regular acceleration of gravity. The following link has a table and series of photos demonstrating that.
WTC 7's Facade Plunged at a Nearly Free-Fall Rate
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