http://www.physics.byu.edu/research/energy/htm7.html
There are still unresolved questions with regard to the WTC building collapses. I don't believe that the "official" explanations sufficiently cover all the bases. Excerpt: The rapid fall of the Towers and WTC7 has been analyzed by several engineers/scientists (http://911research.wtc7.net/wtc/analysis/proofs/speed.html; Griffin, 2004, chapter 2). The roof of WTC 7 (students and I are observing the southwest corner) falls to earth in less than 6.6 seconds, while an object dropped from the roof would hit the ground in 6.0 seconds. This follows from t = (2H/g)1/2. Likewise, the Towers fall very rapidly to the ground, with the upper part falling nearly as rapidly as ejected debris which provide free-fall references (http://911research.wtc7.net/wtc/analysis/proofs/speed.html; Griffin, 2004, chapter 2). Where is the delay that must be expected due to conservation of momentum one of the foundational Laws of Physics? That is, as upper-falling floors strike lower floors and intact steel support columns the fall must be significantly impeded by the impacted mass. If the central support columns remained standing, then the effective resistive mass would be less, but this is not the case somehow the enormous support columns failed/disintegrated along with the falling floor pans. xponent Open Questions Maru rob _______________________________________________ http://www.mccmedia.com/mailman/listinfo/brin-l
