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Politics : Foreign Affairs Discussion Group -- Ignore unavailable to you. Want to Upgrade?

To: geode00 who wrote (202472)	9/10/2006 9:17:47 PM
From: stockman_scott	Read Replies (1) \| Respond to of 281500

The Truth behind 9/11: Who Is Osama Bin Laden? globalresearch.ca

To: geode00 who wrote (202472)	9/11/2006 1:13:15 AM
From: Doug R	Read Replies (2) \| Respond to of 281500

You'll have a problem in thinking the "pancake" explanation works. It's been dropped by NIST and FEMA. The speed at which the buildings fell was less than 1/3 the speed which would have occurred in a pancake collapse. There's actually no gravity-only collapse explanations that satisfy the problem of the rate of fall. Then there's the problem about certain physical aspects of the buildings' destructions. The concrete was pulverized to particles measuring an averge 30 microns in diameter. That's just the concrete. The contents of the buildings were also turned to dust....glass, carpets, desks, computers, inner walls, all the bathrooms. All this dust then went on to form massive pyroclastic flows. The physics of these aspects is very clearcut. The buildings were of known heights and masses. The force due to gravity is a constant. The potential energy for buildings of that height and mass was nowhere near the amount necessary to create these aspects. The math has been done. More than 12 times more energy was necessary. The energy required to convert a tower's 600,000 tons of concrete into dust of 60 micron particle diameter is about 900,000 KWH. Gravitational potential energy is the energy released in a structural collapse, which may typically be dissipated by concrete crushing in a "pile driver" effect. This energy is calculated by the equation U=mgh, with mass in kg, gravitational force constant g=9.8m/s/s, and h in meters. The energy units in this equation are joules (watt-seconds) but large energies are more commonly expressed in kilowatt hours (1kwh=3.6e6 joules). Because the WTC towers are both massive and tall, the gravitational potential energy of each tower is enormous. Assuming a mass of 750,000 tons (6.8e8 kg) falling from an average height of 207 meters (half of the overall height of 1365 feet), the gravitational potential energy is about 1.4e12 joules or 400,000 kwh. the energy required to crush concrete to the size of 60 microns is around 1.5 kwh/ton: b-i-m.de Now that twice the energy available in a gravity-only collapse has been observed...the pyroclastic flows occur. They require over 10 times the available energy. That energy came from somewhere...in just over 10 seconds. 911research.wtc7.net 911-strike.com 911research.wtc7.net