North Tower Acceleration

[jesters]

50. AZCat says:

"You haven't explained your claim that no visible decelerations means the upper portion is not exerting a force on the lower portion."

As I stated in the very post you are replying to:
[quote=jesters]... 2) We are talking about a force that needs to destroy all the connections of 80 - 90 intact steel-framed stories, while pulverizing all contents at the same time, at the average rate of 0.17 seconds per floor. [/quote]

You are attempting to suggest that the 30% resistance provided by the bulk of the intact structure, which, by standard engineering, was capable of providing 300%, is due to gravity acting on the upper block. This point of view apparently does not understand that the force exerted in this instance, as measured by the resistance seen, is not enough to destroy the building, even if it did initially drop in free fall (which it didn't). Not to mention that the upper block destroys itself in the first few seconds of collapse.

"Your #2 is nonsensical."

I've now explained it twice. What part don't you understand?

And can you point us to a credible model of a debris-driven, top-down total destruction of a steel-framed super highrise?