Stinger said:That they were not in free fall has already been proven why do you keep stating it as fact? And yes the force of the air, which the majority of the towers was, we plenty enough to blow things out side ways and upwards as they fell, but the majority of the towers simply collapsed and as they did those parts that were falling off fell faster than the building itself. The films clearly show that along with all the reputable engineering studies.
Zyphlin said:We want teacher. We want teacher.
That is all. These threads are just more fun with him in them, mostly because they've been done 49253250 dozen times before
Pogostick said:
bilbus said:the towers were built to withstand a 727, not a 747 .... there were no 747's twhen it was built ....
tenseconds said:Its over folks. The severed part of the twin towers cannot expel voluminous amounts of microscopic dust particles and crash down into the rest of the structure in ten seconds. This is physically impossible.
Pleaase refer to http://www.911blimp.net/prf_FreeFallPhysics.shtml
Observations from 9/11
On page 305 of the 9/11 Commission Report, we are told, in the government's "complete and final report" of 9/11, that the South Tower collapsed in 10 seconds. (That's the government's official number. Videos confirm that it fell unnaturally, if not precisely that, fast. See for yourself: QT Real)
But as we've just determined, that's free-fall time. That's close to the free-fall time in a vacuum, and an exceptionally rapid free-fall time through air.
But the "collapse" proceeded "through" the lower floors of the tower. Those undamaged floors below the impact zone would have offered resistance that is thousands of times greater than air. Recall that those lower floors had successfully supported the mass of the tower for 30 years.
Air can't do that.
Can anyone possibly imagine the undamaged lower floors getting out of the way of the upper floors as gracefully and relatively frictionlessly as air would? Can anyone possibly imagine the undamaged lower floors slowing the fall of the upper floors less than would, say, a parachute?
It is beyond the scope of the simple, but uncontested, physics in this presentation to tell you how long the collapse should have taken. Would it have taken minutes? Hours? Days? Forever?
Perhaps. But what is certain, beyond any shadow of a doubt, is that the towers could not have collapsed gravitationally, through intact lower floors, as rapidly as was observed on 9/11.
Not even close!
Because, as you may recall, not only was much energy expended in causing the observed massive high-speed sideways ejections, but virtually all the glass and concrete was "pulverized" -- actually "dissociated" is a much better word. (Nevermind what happened to all the supporting steel core columns...!!!) And the energy requirements to do anything even remotely like that rival the total amount of potential energy that the entire tower had to give. (source) So while gravity is nearly strong enough to cause some things to fall that far, through air, in the observed interval, and while gravity is probably not strong enough to have so thoroughly disintegrated the towers under their own weight, gravity is certainly not strong enough to have done both at once.
Conclusions
In order for the tower to have collapsed "gravitationally", as we've been told over and over again, in the observed duration, one or more of the following zany-sounding conditions must have been met:
The undamaged floors below the impact zone offered zero resistance to the collapse
The glass and concrete spontaneously disintegrated without any expenditure of energy
On 9/11, gravity was much stronger than gravity
On 9/11, energy was not conserved
However, none of these physics-violating conditions can be accounted for by the official government conspiracy theory of 9/11, nor by any of the subsequent analyses designed to prop up the official theory of 9/11.
Bottom line: the government/PBS/PM/SA explanation for the WTC collapses fails the most basic conservation-of-energy reality check. Therefore the government/PBS/PM/SA theory does not fit the observed facts; the notion of a "pancake collapse" cannot account for what happened. The "pancake collapse theory" explanation is impossible, and thus absurd.
It is utterly impossible for a "gravitational collapse" to proceed so destructively through a path of such great resistance in anywhere near free-fall times. This fact debunks the preposterous contention that the observed WTC collapses can be blamed solely upon damages resulting from aerial assaults.
So, to the extent that people accept the ridiculous "pancake collapse" explanation, Gates' other premise, that people know what they saw, is also incorrect. It is left to the reader to decide if his conclusion, which was based upon two incorrect presumptions, is also flawed.
The purported "gravitational" collapse (video) of World Trade Center building 7, which was hit by zero aircraft, and which also vertically collapsed in within a second of free-fall-time-in-a-vacuum later that same day, similarly fails this same conservation-of-energy analysis.
The explanation for how and why so many highly-accredited and credentialed people all so miserably failed to check the "pancake collapse" theory, by giving it this basic reality check, is beyond the scope of this simple physics discussion. :mrgreen:
http://www.911blimp.net/graphics/suspendedWTCtop1.gif
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