The attack on the WTC: The twin towers of the World Trade Center were built to withstand the impact

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September 11, 2001: A powerful and terrible terrorist attack occurred on the morning of September 11, 2001 (at exactly 8h48m and 9h03m local), hitting the two towers of the largest shopping complex veterinary practice news in the world, the World Trade Center in New York, who came down hours after it was partially destroyed by two Boeing veterinary practice news 767 commercial aircraft, with a total of 157 passengers on board. They had taken off from Boston (at 7h58m with 65 passengers and 7h59m with 92 passengers and both bound for Los Angeles).
The attack on the WTC: The twin towers of the World Trade Center were built to withstand the impact of a Boeing 727 aircraft when not fallen entered through the windows, a maneuver which revealed the enormous expertise of those who flew them. The way the terrorists hit the buildings gives evidence of a planning graph. At top speed, over 800 km
per hour, a large amount of such aircraft pushes air in front of it is virtually impossible to hit a wall in a frontal collision. "The turbulence was so strong on the wall that would take away the Boeing trajectory", explains David Barioni Neto, technical vice president veterinary practice news of airline Gol. So they flew more slowly - it is estimated that 450 kilometers per hour - and opted for curved trajectory to reach the goal. In the case of the Pentagon, where there are no images of the moment of impact, the problem is similar. Down an aircraft of 115 tons a airport runway requires combining speed and aerodynamics with precision equipment. Land on a specific target is almost a lottery. At all times, veterinary practice news the extremists have shown the knowledge of who spent time in a flight simulator, and effective practice. Turned off, for example, the transponders which emit electronic signals on the location of the aircraft. Also began to fly at low altitude, off the radar. And at least one case, they sent that passengers connecting by phone to advise them of the kidnapping was. Wanted maximum publicity for his actions and acted as if they had anticipated the scenario that would build.
Even very damaged, the towers would have fallen only with shocks of 767 against their structures. Each aircraft crashed into the steel frames and glass with a force equivalent to over 1000 times its own weight impact. Most of the aircraft structure is of aluminum. veterinary practice news Such a hit, your body will deform, frowning, even transfer over the surface reached a force capable of tearing it. At this point, everything is in its interior has been thrown forward as if there was an instant braking. Only then the rest of the fuselage penetrates the structure. When this happened, the buildings shook, swayed and creaked, as have survivors of the terrorist attack in New York, but remained standing. Many people who were on the lower floors escaped death in the next hour. People who were above the 103rd floor in the north building, the first to be hit, or 93 of the south tower did not have the same chance. The planes in flames practically divided their targets in two blocks. Everything that was directly hit the floors, furniture and people, was pulverized by the explosion or thrown out by air displacement. Who was above the collision point had no chance to pass through the wall of flames that took almost ten floors of each building. All of these people end up dying - in the fire, a jump of more than 300 meters or collapse.
Were the fires, combined with a technological feature of skyscrapers that put them below. On impact, each affected area immediately reached the temperature of 450 degrees Celsius, the point of combustion of aviation fuel. Each Boeing took enough veterinary practice news to fly over 4000 km fuel - or to burn for a few hours. Partitions and furniture wood and plastic are also burned. The temperature reached 1,000 degrees. The steel does not melt at this point, but it loses toughness. Supported by steel columns in its outer frame, as cages, several buildings had them cut by the knife penetration effect of aircraft. Then came quickly to the point of structural collapse because of the weight on the tops to the points veterinary practice news that happen