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Originally Posted by shima
What is the official version? That plane crashed into the building and blast heated 4 steel columns that were holding the top? So ok, all 4 of them suddenly got heated upto 6000'C and melted? I think this doesn't sound real..
Anyway 1 of the steel columns supposed to melt faster than 3 others, this would cause the "cap" to fall on a side of the building, and not directy down.
Pure Physics.
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It's not "pure physics". It's a quite-complicated engineering problem. You know, engineers, those guys who designed the Tacoma Narrows bridge. Physicists and engineers have presented many different explanations of how it is that bridge collapsed. Sixty years later they still do.
There's quite a degree of imprecision in trying to model what will happen under such complicated circumstances.