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mass of material (> 10 x 10^6 tons) reduced to dust and smoke (introduction, P.2, L.10 )
Sample L18-2 was taken 0.25km from the center of ground zero
Cortlandt Street sample was 200meters from the perimeter of the WTC site.
the dust pile AT ground zero was 1600ug/m^3 and 5 times higher than the outer perimeter of the dust cloud/settled dust and it became uniform at 300ug/m^3.
Levels of PM2.5 very highly elevated above normal urban background were detected in the first days after 11 September (Figure 3). The sampling sites were not located directly in the path of the WTC plume, and thus actual levels may have been still higher.
Coarse dust generated by demolition was detectable in ambient air until December, when pollution from the site diminished greatly.
Both towers were built out of steel frames, glass, and concrete slabs on steel truss joists. A single tower consists of 90,000,000 kg (100,000 tons) of steel, 160,000 cubic meters (212,500 cubic yards) of concrete and 21,800 windows. One single tower has a mass of about 450,000,000 kilograms (P.3 Eric Chen)
The energy required to reduce concrete to 60 micron powder 1.5 kwh/ton
Originally posted by SteveR
I tend to lean toward the theory that they were needed to bring the WTC down. We're talking about two buildings that dwarf the giant skyscrapers in NYC, perhaps the perpetrators felt conventional explosives just wouldn't do the trick in small quantities.
Phil Schneider, the murdered world-class explosives expert, (who worked for the US Gov by the way), said that micro-nukes are used as a method of demolition. That comment was pre-911 ofcourse, but it's a good one. It shows that this is entirely feasible.
Originally posted by Damocles
MOS: 12E Atomic Demolitions
was an actual army job, they used very small sized nuclear weapons.
the description given to me by a drill sgt who had been a 12E until the job was shut down was "you spend hours packing a bridge with C4. i walk out into the middle, drop my backpack, leave, and a few hours later theres a manmade lake where the bridge was"
small nukes, but still nukes. all the radiation, big ole mushroom cloud...just not a missile.
Originally posted by bsbray11
Small h-bombs would have primarily only been used (or so I'm thinking) to quickly remove concrete from the core structure. Then more conventional cutter charges could be used here and there only so much as to drop what remained of the cores straight down, as with the spire.
Originally posted by mbkennel
Nobody has demonstrated any thermonuclear ignition of substantial magnitude without a fission weapon primary. Certainly nothing remotely weaponized or weaponizable.
The reality is that the WTC buildings and the Pentagon were destroyed by collisions with large aircraft.
Originally posted by mbkennel
Static analysis of safety factors---ok on their own---don't account for situations where all hell brakes loose and many supporting elements are removed and in an extreme thermal environment.
If your guidelines do not account for experimental observations then there is a problem with the theory. The inability to do a detailed fluid mechanical explanation of X in perfect quantitative detail (because of a lack of lknoweldge) doesn't mean that instead it was done by Martians using a magic blow-up beam (oops, sorry "scalar weapon").
All the 'alternative' physical explanations are far far far less feasible.
There are fundamental logical problems with the conspiracy theories as well, as in "none of them make sense".
Like, if the They are going to blow up the WTC, why bother with planes?
Originally posted by mbkennel
If it had been some "grand conspiracy" operation, they would have been demolished with bombs [...] and blamed on Saddam Hussein's secret service. They would have invaded Iraq the next month, which is what they wanted to do. Clean and effective.
And here is a view of lower Manhatten. It takes enormous amounts of energy to make clouds like that
Originally posted by mbkennel
My sister saw the plane in DC. My wife saw the plane in NYC.
Originally posted by Scramjet76
And here is a view of lower Manhatten. It takes enormous amounts of energy to make clouds like that
[...]
I'm sure the collapse of 2 110-story towers would generate clouds/dust of much greater magnitude than the Kingdome did.