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Originally posted by spacevisitor
[Because there is no doubt in my mind that they have already take their precautions, they have already created enormous state of the art underground facilities for surviving that kind of disasters for a very long time.
The height of the South Tower is 1362 feet. I calculated that from that height, freefall in a vacuum (read, absolutely no resistance on earth) is 9.2 seconds. According to testimony provided to the 9-11 Commission, the tower fell in 10 seconds. Other data shows it took closer to 14 seconds. So the towers fell within 0.8-4.8 seconds of freefall in a vacuum. Just like WTC7, this speed seemed impossible if each of the 110 floors had to fail individually.
As I was considering this, another problem arose. There is a principle in physics called the Law of Conservation of Energy. There is also the Law of Conservation of Momentum. I’ll briefly explain how these principles work. Let’s assume there are two identical Honda Civics on the freeway. One is sitting in neutral at a standstill (0 mph). The other is coasting at 60 mph. The second Honda slams into the back of the first one. The first Honda will then instantaneously be going much faster than it was, and the second will instantaneously be going much slower than it was.
This is how the principle works in the horizontal direction, and it works the same in the vertical direction, with the added constant force of gravity added to it. Jim Hoffman, a professional scientist published in several peer-reviewed scientific journals, took a long look at all of this. He calculated that even if the structure itself offered no resistance, that is to say, even if the 110 floors of each tower were hovering in mid-air, the “pancake” theory would still have taken a minimum of 15.5 seconds to reach the ground. So, even if the building essentially didn’t exist, if it provided no resistance at all to the collapse, just the floors hitting each other and causing each other to decelerate would’ve taken 15.5 seconds to reach the ground.
Originally posted by SimiusDei
reply to post by thedman
Even with that being the case, the rate the towers fell is still unexplainable without throwing in the factor of them having help on the way down.
The resistance the top portion of the tower should have met from the bottom portion should have been great enough to slow the descent down considerably. However, if you will watch the videos, you will see almost zero resistance from the bottom floors. The towers never so much as BRIEFLY hesitate in the descent.
Also, tower 7, which was not struck by a plane and therefore had no jet fuel burning inside of it, shows this exact same defiance of physics in it's collapse. It takes the tower just .5 seconds longer than freefall in a vacuum to collapse completely into it's footprint.
That is, simply put, impossible without "help".
Jasn
Originally posted by SimiusDei
That is, simply put, impossible without "help".
Jasn