Originally posted by dudly
reply to post by iamcpc
When you state that they dont even attempt to determine how much damage was done by the planes and the fire, are you talking about the NIST report or
the people on the site Physics911.net?
I'm talking about the physics911.net. Nist attempted to determine how much damage was done by the airplane impacts and fire.
For any building to fall that way and at that speed
The speed of the collapse is one that has been debated.
"The CNN video suggests that it takes about ten seconds for the bottom of the mushrooming dust cloud to reach the ground, and another seven or so for
the top to reach the ground. The following composite timeline combines timing estimates of collapse events from the CNN video and the PAL seismic
record. It assumes rubble hitting the ground caused the large ground movement, and thus that the crumbling of the Tower prior to that caused only
minor ground movement. Given that, the times from these pieces of evidence match up remarkably well. "
"Various pages on columbia.edu put the origin time of the signal at the source at 10:28:31, plus or minus one second. This is based on an estimate of
2 km/s travel speed for the S waves, which, given the PAL station's distance of 34 KM from the WTC, gives a travel time of 17 seconds.
10:28:23 Top of the North Tower starts to break apart
10:28:31 Rubble starts to hit the ground (start of big signal)
10:28:36 The heaviest rubble hits the ground (peak of big signal)
10:28:39 Most heavy rubble has reached the ground (end of big signal)"
says 16.6 seconds
says 12.8 seconds
through the Path of Greatest Resistance,
Anok talks about this. It make sense to me to be an example of PROOF that something in addition to airplanes and fire caused the collapse of the WTC.
I spoke with my physics professors, Steven Wilson and
Douglas Patterson about this. We, after estimating the weight of the top 30 floors of the WTC tower, determined that the falling top portion of the
building had about 400 times the amount of force that the airplane had when it hit..
What would the WTC look like if each floor got hit with 3.9 110-150 ton 500 mile per hour airplanes? A big pile of rubble.
They explained that the building collapsed through the path of least resistance. How is that possible? How is the the path of the least resistance
through the support structure? I started understanding after they explained to me.
When you have the top portion of the building accelerating downward at 8.9 m/s with X newtons of force and the suuport structure can only hold 1/10th
X and the amount of force needed to cause the falling top portion to stop falling straight down and fall to the side is 1/5th X the path of least
resistance involves crushing the support structure.
Think about crushing an aluminum can with a cinderblock. The aluminum can collapsed downward through it's support structure which is also the path of
the least resistance. The force needed to cause the cinderblock to fall sideways and only partially crush the can is greater than the force the can
and at the speed at which all three buildings fell
WTC 7 may have fallen too quickly. I don't know. Before I can say that the twin towers collapsed too quickly shouldn't we know how quickly they