9/11 Question ('Squibs'?)

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The direct answer the to the OP question

Velocity of Air Ejected from the Tower
An upper bound on area through which the air initially contained within every story gets
expelled (Fig. 3a) is Aw = 4ψahc , where 4ahc = area of one perimeter wall, a = 64 m = width
of the side of square cross section of tower, hc = 3.69 m = clear height of one story = distance
from the bottom of a story slab to the top of the underlying slab, and ψ = vent ratio = ratio
of unobstructed (open) area of the perimeter walls to their total area (ψ
≤ 1). The initial
mass of air within one story is ma = ρa a2 hc , where ρa = 1.225 kg/m3 = mass density of air at
atmospheric pressure and room temperature. Just outside the tower perimeter, the air jetting
out (Fig. 3a) must regain the atmospheric pressure as soon as it exits (White 1999, p.149), and
its temperature must be roughly equal to the initial temperature (this is a well-known general
feature of exhausts, e.g., from jet engines (White 1999, p.149) or pipes (Munson et al. 2006)).
So, the mass density of exiting air ρ
≈ ρa .
The time during which the top slab collapses onto the lower slab
≈ ∆t = hc / ̇z = time
during which the air is expelled out (which is only about 0.07 s for stories near the ground).
Conservation of the mass of air during the collapse of one story requires that ρAw (va ∆t) = ρVa .
Solving this equation gives the average velocity of escaping air just outside the tower perimeter:
va = Va
ψAw ∆t =
a ̇z
4ψhc (7)
Since the velocity of the crushing front near the end of North Tower crush-down is, according
to the solution of Eq. (2), ̇z = 47.34 m/s (106 mph), the velocity of escaping air near the end
of crush-down is
va = 64m × 47.34m/s
4ψ
× 3.69m
=

Thanks :)

I'll someone better at math than I am confirm the math is valid (I have no reason to suspect otherwise, but it never hurts to check). Barring mathematical error, your two posts have answered the question I had.

Thank you.,


Thread Over.
 
its a load of unverified bullshit...bullshit and pseudo -science laid on so thick.. as to stand logic on its head

Dwain Deets, MS Physics, MS Eng – Former Director, Aerospace Projects, NASA Dryden Flight Research Center. Before this appointment, he served as Director, Research Engineering Division at Dryden. Recipient of the NASA Exceptional Service Award and the Presidential Meritorious Rank Award in the Senior Executive Service (1988). Selected presenter of the Wright Brothers Lectureship in Aeronautics, a distinguished speaking engagement sponsored by the American Institute of Aeronautics and Astronautics (AIAA) (1986). Included in "Who's Who in Science and Engineering" 1993 - 2000. Former Chairman of the Aerospace Control and Guidance Systems Committee of the Society of Automotive Engineers. Former Member, AIAA Committee on Society and Aerospace Technology. 37 year NASA career.
Statement in support of Architects and Engineers petition:


"The many visual images (massive structural members being hurled horizontally, huge pyroclastic clouds, etc.) leave no doubt in my mind explosives were involved [in the destruction of the World Trade Center]." AE911Truth


Signatory: Petition requesting a reinvestigation of 9/11, signed by more than 950 Architects and Engineers:

"On Behalf of the People of the United States of America, the undersigned Architects and Engineers for 9/11 Truth and affiliates hereby petition for, and demand, a truly independent investigation with subpoena power in order to uncover the full truth surrounding the events of 9/11/01 - specifically the collapse of the World Trade Center Towers and Building 7. We believe that there is sufficient doubt about the official story and therefore that the 9/11 investigation must be re-opened and must include a full inquiry into the possible use of explosives that may have been the actual cause behind the destruction of the World Trade Center Towers and WTC Building 7."
Patriots Question 9/11 - Responsible Criticism of the 9/11 Commission Report

you keep listing people from this really small list of architects and engineers as if its of any significance at all.

in 2008 there were about 1,600,000 engineers and 141,200 architects employed in the USA. that doesnt include the people that are retired or out of the country as in your list of only 950 people.

read that again because i know you have trouble understanding things. thats about 1,750,000 people to your 950.

hardly impressive.:cuckoo:

Engineers
Architects, Except Landscape and Naval


The question was answered with logic and mathematics- the highest form of proof.. There's no need to argue over his appeal to authority.

Thanks you for the link and alas for posting the contents when I forgot I didn't have adobe reader installed at the moment :redface:
 
☭proletarian☭;1884712 said:
if it is pulverized how does it have the mass to crush the floor beneath why ? does the collapse never slow significantly ?
Um, dude... pulverizing something doesn't change the amount of mass it has in total. :eusa_eh:

so a block of ice falling of your roof would have the same effect as if it were vaporized a descend on your roof as a cloud and cloud of pulverized concrete flowing down the street would have the same destructive force as a block of concrete flying down the street ...lol
 
☭proletarian☭;1884718 said:
its a load of unverified bullshit...bullshit and pseudo -science laid on so thick.. as to stand logic on its head

Dwain Deets, MS Physics, MS Eng – Former Director, Aerospace Projects, NASA Dryden Flight Research Center. Before this appointment, he served as Director, Research Engineering Division at Dryden. Recipient of the NASA Exceptional Service Award and the Presidential Meritorious Rank Award in the Senior Executive Service (1988). Selected presenter of the Wright Brothers Lectureship in Aeronautics, a distinguished speaking engagement sponsored by the American Institute of Aeronautics and Astronautics (AIAA) (1986). Included in "Who's Who in Science and Engineering" 1993 - 2000. Former Chairman of the Aerospace Control and Guidance Systems Committee of the Society of Automotive Engineers. Former Member, AIAA Committee on Society and Aerospace Technology. 37 year NASA career.
Statement in support of Architects and Engineers petition:


"The many visual images (massive structural members being hurled horizontally, huge pyroclastic clouds, etc.) leave no doubt in my mind explosives were involved [in the destruction of the World Trade Center]." AE911Truth


Signatory: Petition requesting a reinvestigation of 9/11, signed by more than 950 Architects and Engineers:

"On Behalf of the People of the United States of America, the undersigned Architects and Engineers for 9/11 Truth and affiliates hereby petition for, and demand, a truly independent investigation with subpoena power in order to uncover the full truth surrounding the events of 9/11/01 - specifically the collapse of the World Trade Center Towers and Building 7. We believe that there is sufficient doubt about the official story and therefore that the 9/11 investigation must be re-opened and must include a full inquiry into the possible use of explosives that may have been the actual cause behind the destruction of the World Trade Center Towers and WTC Building 7."
Patriots Question 9/11 - Responsible Criticism of the 9/11 Commission Report

you keep listing people from this really small list of architects and engineers as if its of any significance at all.

in 2008 there were about 1,600,000 engineers and 141,200 architects employed in the USA. that doesnt include the people that are retired or out of the country as in your list of only 950 people.

read that again because i know you have trouble understanding things. thats about 1,750,000 people to your 950.

hardly impressive.:cuckoo:

Engineers
Architects, Except Landscape and Naval


The question was answered with logic and mathematics- the highest form of proof.. There's no need to argue over his appeal to authority.

Thanks you for the link and alas for posting the contents when I forgot I didn't have adobe reader installed at the moment :redface:

right ...you confirmed the math but Deets just doesn't get it...lol
 
Eots...appeals to authority are wrong, no matter who the authority. What matters is the proof. Is the proof valid or not. The most eminent scientist is still not the argument.

If you read the thing, you would see the answered all your objections. It was not fee fall. It moved pretty fast, but it was not free fall. The rate of pulverization of the concrete shows it was not controlled demolition.

Were these people to get a new investigation, they would get these numbers, and they would shut them up. And indeed, they may have.
 
If you watch the video after reading Fizz's very interesting link you will understand what you are seeing better. The squibs are jets of air expelled from broken windows as the floors compress. The go way out from the side of the building. Explosions just don't behave that way.
 
☭proletarian☭;1884712 said:
if it is pulverized how does it have the mass to crush the floor beneath why ? does the collapse never slow significantly ?
Um, dude... pulverizing something doesn't change the amount of mass it has in total. :eusa_eh:

so a block of ice falling of your roof would have the same effect as if it were vaporized a descend on your roof as a cloud and cloud of pulverized concrete flowing down the street would have the same destructive force as a block of concrete flying down the street ...lol

vaporized means it turned into a gas. are you saying that the concrete turned into a gas or are you just not smart enough to use a valid comparison?

a block of ice falling off your roof would have the same amount of mass if it was turned into ice chips.
 
air pressure, as the building collapsed, air was forced down and out

:lol: what other fairy tales you have to tell?:lol::lol: rolls on floor with laughter.
dont listen to him dude,those are squibs caused by explosives.all you got to do to see this is true is look at Richarg Gages video where he shows videos of controlled demolitions of buildings taking place and they match up exactly like the towers.Not to mention witness and expert testimonys prove explosives brought the towers down.:lol:
 
its a load of unverified bullshit...bullshit and pseudo -science laid on so thick.. as to stand logic on its head

Dwain Deets, MS Physics, MS Eng – Former Director, Aerospace Projects, NASA Dryden Flight Research Center. Before this appointment, he served as Director, Research Engineering Division at Dryden. Recipient of the NASA Exceptional Service Award and the Presidential Meritorious Rank Award in the Senior Executive Service (1988). Selected presenter of the Wright Brothers Lectureship in Aeronautics, a distinguished speaking engagement sponsored by the American Institute of Aeronautics and Astronautics (AIAA) (1986). Included in "Who's Who in Science and Engineering" 1993 - 2000. Former Chairman of the Aerospace Control and Guidance Systems Committee of the Society of Automotive Engineers. Former Member, AIAA Committee on Society and Aerospace Technology. 37 year NASA career.
Statement in support of Architects and Engineers petition:


"The many visual images (massive structural members being hurled horizontally, huge pyroclastic clouds, etc.) leave no doubt in my mind explosives were involved [in the destruction of the World Trade Center]." AE911Truth


Signatory: Petition requesting a reinvestigation of 9/11, signed by more than 950 Architects and Engineers:

"On Behalf of the People of the United States of America, the undersigned Architects and Engineers for 9/11 Truth and affiliates hereby petition for, and demand, a truly independent investigation with subpoena power in order to uncover the full truth surrounding the events of 9/11/01 - specifically the collapse of the World Trade Center Towers and Building 7. We believe that there is sufficient doubt about the official story and therefore that the 9/11 investigation must be re-opened and must include a full inquiry into the possible use of explosives that may have been the actual cause behind the destruction of the World Trade Center Towers and WTC Building 7."
Patriots Question 9/11 - Responsible Criticism of the 9/11 Commission Report

it sure is a load of unverifiable bullshit..hundreds of architects and engineers along with demoliton experts and witness testimonys not to mention the laws of physics prove that explanation is bullshit.:lol:
 
if it is pulverized how does it have the mass to crush the floor beneath why ? does the collapse never slow significantly ?

When does a collapse ever slow down?

a free fall does not slow down ...a collapse should experience a loss of energy as it overcomes the resistance of each floor below

There was no free fall

a collapse would experience more force as the point of collapse progresses down, as more and more weight is added to the collapsing part of the tower
 
it sure is a load of unverifiable bullshit..hundreds of architects and engineers along with demoliton experts and witness testimonys not to mention the laws of physics prove that explanation is bullshit.:lol:

Name one expert in building demolitions that supports AE911 truth -- one person who you can show has examined the evidence and opined on the subject

not military guys that blow up bridges with bombs, I'm talking the experts that design and implement building destructions

name one from any place in the world
 
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