sci.physics

In article < @ >,
Henry <9-11@ > wrote:
>rb608 wrote:
>> "Henry" <9-11@ > wrote in message
>
>>> On 9-11-01, WTC7, a 47 story steel framed building, which
>>> had only small, random fires, dropped in perfect symmetry
>>> at near free fall speed as in a perfectly executed controlled
>>> demolition.
>
>> F=ma
>
>> Once the first failure occurs for whatever reason, an enormous mass
>> of material
>
> What enormous mass of material? In the towers, the upper block
>was built from steel that was at least ten times lighter and
>thinner than the steel in the massive undamaged frame below.
>The fact that you "think" the upper block should fall directly
>through 80,00 tons of cold steel at the same rate it would
>fall through air only proves that you can't think logically.
> Here, read what this PhD engineer has to say about that.
>He even includes an illustration for folks like yourself who
>are a little slow to grasp basic concepts of logic.
>
> /letters/g/
>
>
>> falls at free fall speed until it interacts with another support
>> below.
>
> It interacts with the supports below from the very start. That's
>why it can't accelerate at free fall speed at any time. 80,000 tons
>of undamaged cold steel will produce considerably more kinetic friction
>than air - at least here on planet Earth.
>
>> The structural capacity of that support is miniscule compared to the
>> mass and momentum of the falling debris,
>
> Complete idiocy. All steel framed structures have a huge
>reserve strength built into them. The mass of the upper block




Every steel structure collapsses shortly after the fireproofing is
destroyed or heated through. The goal of fireproofing on steel is to
give time for the fire deptartment to show up and put water on the
fire.

There was no water on 9/11.


(actually, there was one hose from a fireboat in Hudson river. It was
used to cool down the spots where firemen thought there might be
survivors.)








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