On 12/6/06, gacrowell@micron.com wrote: > > But the 'Billiard Balls' model assume that each floor starts from zero > velocity, and are accelerated by gravity alone, apparently assuming that > all of the energy of the falling upper floors is consumed, exactly, by > the energy to collapse and pulverize the next floor. Any acceleration > from the impact of the upper floors is dismissed, and this would seem > hugely unlikely. It also may be that shock transmitted through the structure significantly damaged the lower floors before impact. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist