Quote Originally Posted by psikeyhackr

No one else seems to be demanding to know the tons of steel and tons of concrete on every floor.

The NIST tells us the building oscillated for 4 minutes. How do you compute how much kinetic energy shook the entire building versus how much did structural damage at the point of impact? Isn't that necessary to do an accurate computer model?
psik
I kept getting interrupted when I tried to watch the video, but the physics appeared sound to me.

http://hyperphysics.phy-astr.gsu.edu...ewt.html#ntcon

I remember Newton's own words saying that an applied force is proportional to the rate of change of momentum of the body (not F=ma per se). F=dp/dt, if you will. It's really a matter of semantics for classical mechanics though. In quantum mechanics and optics, photon momenta and radiation "pressure" gets a little "trickier" since you can't weigh the things...

There are a few places that mention the steel and concrete floor masses/loads.

[metric units from my review]
http://911research.wtc7.net/mirrors/...tc/godfrey.htm

http://www.911research.com/papers/tr...lysisFinal.htm

http://911research.wtc7.ent/mirrors/...ews-record.htm

http://www.journalof911studies.com/v...TwinTowers.pdf

http://911research.wtc7.net/wtc/evid...lueprints.html

[I've found some questionable findings in this MIT paper IMHO]
http://web.mit.edu/civenv/wtc/PDFfil...Structures.pdf

[Very suspect findings in this paper with gems like:]
"Additionally, the FEMA team carried the computer analysis only to a point in time immediately after the impacts; they did not consider the effects of the fire."
http://132.236.67.210/EngrWords/issu...ensonC_PR1.pdf

Regarding the WTC Tower oscillations, these should be impulse-driven, damped oscillations (likely harmonic due to the symmetry in Tower construction). Impulse physics is not well understood AFAIK (usually instrumented crash-test-dummy type stuff). And yes, these SHOULD BE accounted for in an ACCURATE computer model... Who has the source code of the simulations exactly?