Physics explains order of WTC Collapse

south_tower_collapse.jpgThe 9-11 Truth Movement and other conspiracy theorists have numerous crazy claims. One such claim is that they insist the fact that the South Tower was the first to collapse, despite being hit second is proof of controlled demolition. However, this could not be further from the truth. There are several reasons why the South Tower collapsed first despite being hit second and the reasons rely on good, old-fashioned physics.

One obvious reason, as pointed out at 9/, is that the South Tower was struck at a lower point than the North Tower, which means that the damaged WTC 2 had more weight to support than WTC 1. The size and speed of the aircraft also had something to do with it, as well. As you can see here, the Twin Towers were designed to withstand the impact of a Boeing 707, which was the largest aircraft in existence at the time the WTC was built.

In point of fact, FEMA states that the Boeing 707 that was taken into account for the design of the World Trade Center was assumed to have a gross weight of 263,000 pounds and going about 180 MPH on landing approach ( or in the fog). However, the Boeing 767’s that hit the North and South Towers were going about 470 to 590 MPH, respectively, plus the fact that a Boeing 767 has an estimated gross weight of 274,000 pounds. Kinetic energy (a.k.a. “energy of motion” is ½ mass times the square of the velocity, written as KE = ½ mv² (this equation can be found in any physics book). Notice that there is a difference of 11,000 pounds, or 5 ½ tons, between a Boeing 707 and a Boeing 767 (a difference of 5½ tons is not to be taken lightly).

One need not do the math to see that the planes that hit the Twin Towers on September 11, 2001 did so with far more kinetic energy than they were designed to withstand. Also, as you can see, the plane that hit the South Tower was going 120 MPH faster than the one that hit the North Tower, and as you can see by the equation, if you increase velocity by 120 MPH, the energy has to increase by a factor of 14,400.

In short, in addition to hitting the South Tower at a lower point, the plane in question also hit the South Tower with considerably more energy than the North Tower.


Posted December 3, 2007 by Victor Chabala in Real 9/11 Facts

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