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Old 09-17-2006, 09:56 PM   #561 (permalink)
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Quote:
Originally Posted by Ustwo
Ptolemy had a very intricate system to show how the planets could still revolve about the earth, since the thought of the earth revolving about the sun was unthinkable. Its amazingly complex, full of laws for each planet, its a masterpiece of mathmatics. It also shows that no matter how wrong an idea is, you can find a way to justify it.

What we have here is a Copernician viewpoint in that the planes caused all the damage of 9/11. Its a solution which works, and while not every fact is known, (Copernicus thought the planets moved in circular orbits), the main idea is 100% correct.

Then we have the Ptolemaic view, which is that the most cunning and devious plan in perhaps of all time was carried out under the noses of millions of people, executed flawlessly, and perfect enough to fool every qualified investigator. Much like a 1400 century man who can't give up a geocentric world view, the 9/11 conspiracy type can not accept that their world view was in error and they invent their own types of retrograde motions to complicate the most basic of events.
Another coincidence. Just the other day I was telling someone to be careful defending a hypothetical situation. Not to defend with such vigor as to lose sight of your opposition's argument; to lose sight of the possibility of being wrong.

I hold complete contempt for Bush and his actions. But Bush is not the problem (Yes UsTwo, a liberal who doesn't think Bush is the problem). He's just taking advantage of something that was already here.
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Old 09-17-2006, 10:23 PM   #562 (permalink)
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Quote:
Originally Posted by Seaver

Uh-huh. So at 600mph a pilot can gague within seconds exactly what floor they are going to hit? That would leave about 3-4 seconds maximum, with a plane that makes a bus seem sporty. Try counting out the floors in a 100+ story building and getting within 5 floors in less than one second because of the time it'd take to maneuver it to hit said floor.

Plus, the building started collapsing at the level of impact, if it was a detonation 10 stories down I think we'd notice.
There is the whole other conspiracy theory which is that Arab students who have never flown before couldn't have been good enough to hit buildings; therefore 'the government' took over the controls on certain aircraft it had modified with the UAV fly-by-wire technology or other remote control methods that we have.
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Old 09-18-2006, 01:02 AM   #563 (permalink)
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Quote:
Originally Posted by Seaver
*BANG BANG BANG*

What was that?
Oh that was your science teachers committing suicide in embarrasment.
No argument here, just flaming and a COMPLETE lack of evidence. Do you want to actually try and disprove the 1500C temp? Or don't you have a good argument?
Quote:
Originally Posted by Seaver
Uh-huh. So at 600mph a pilot can gague within seconds exactly what floor they are going to hit? That would leave about 3-4 seconds maximum, with a plane that makes a bus seem sporty. Try counting out the floors in a 100+ story building and getting within 5 floors in less than one second because of the time it'd take to maneuver it to hit said floor.
Uh huh, so at 600 MPH a pilot who is horrible at flying planes flies a commercial liner into a building. Sure thing.
Quote:
Originally Posted by Seaver
Plus, the building started collapsing at the level of impact, if it was a detonation 10 stories down I think we'd notice.
Obviously not.

Notice the dust puffs several stories below the collapse.
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Old 09-18-2006, 07:01 AM   #564 (permalink)
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Quote:
Originally Posted by willravel
No argument here, just flaming and a COMPLETE lack of evidence. Do you want to actually try and disprove the 1500C temp? Or don't you have a good argument?
There is no need to defend it; fire is that hot, saying it isn’t just stupid. fastom has a fundamental misunderstanding of science, specifically but not limited to heat, temperature, and energy.
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Old 09-18-2006, 07:05 AM   #565 (permalink)
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Quote:
Originally Posted by willravel

Notice the dust puffs several stories below the collapse.
Have you seen building schematics? There are pipes of water, vents, etc. Air pressure changing as the building collapses pushes air pressure down vents/pipes, those things have to go someplace especially in pipes since they are closed systems. Vents would be pusing air out, but eventually it would flow much more than it was designed for and push out greater amounts of air.

To see simply how this works take a garden hose and blow with your mouth from one end, then use a high pressure compressor on the same end and see the difference in how much distance the water goes from the other end.
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Old 09-18-2006, 07:40 AM   #566 (permalink)
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Quote:
Originally Posted by Dilbert1234567
There is no need to defend it; fire is that hot, saying it isn’t just stupid. fastom has a fundamental misunderstanding of science, specifically but not limited to heat, temperature, and energy.
I was responding to Seaver, someone content to try and ride your coat tails and flame.

Fatsom said the fires were not 1500C, a fact that even Popular Mechanics agrees with:
Quote:
Originally Posted by Popular Mechanics
Anyone who says that jet fuel, even assisted by perfect burning conditions, can reach a temperature of 1500C, or 2732F, needs to revisit basic chemistry and physics. 1500F is about 815.56C, the number that most 9/11 conspiracy theorists and debunkers alike agree on. Unless you're ready to say that Popular Mechanics, the primary antagonit to 9/11 conspiracy theorists, is wrong, then I suggest we agree from here on that the fires could not have been higher than 815C if they were caused by and fueled by airplane fuel. Fatsom is right to point out that 1500C is an outragous number, and I give him props for sticking with it. If you continue to claim 1500C, then you should admit that the fure was not fueled by the egular contents of the WTC and the jet fuel. In essence, you'd have to admit foul play and thus join the dark side. You'd be welcomed with open arms, of course, but I don't see that happening.

Fatsom also mentioned the fire suppresing system, something that isn't often discussed. We don't know a lot about the sprinkler system, and it could play a large part in the science of our discussion.

Quote:
Originally Posted by Cynthetiq
Have you seen building schematics? There are pipes of water, vents, etc. Air pressure changing as the building collapses pushes air pressure down vents/pipes, those things have to go someplace especially in pipes since they are closed systems. Vents would be pusing air out, but eventually it would flow much more than it was designed for and push out greater amounts of air.

To see simply how this works take a garden hose and blow with your mouth from one end, then use a high pressure compressor on the same end and see the difference in how much distance the water goes from the other end.
The buildings fell at basically a free fall speed. Are you suggesting that the copllapsing debris and dust inside the building were moving fast that free fall speeds? Do you know how much pressure that would take?

Last edited by Willravel; 09-18-2006 at 07:42 AM.. Reason: Automerged Doublepost
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Old 09-18-2006, 07:45 AM   #567 (permalink)
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Quote:
Originally Posted by willravel
The buildings fell at basically a free fall speed. Are you suggesting that the copllapsing debris and dust inside the building were moving fast that free fall speeds? Do you know how much pressure that would take?
No I haven't any idea, but I can use simulation of basic physics and science. Again, taking that same hose, and flatten it from one end to the other, the faster you flatten it the faster and with more pressure the contents have to eject out the other side.
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Old 09-18-2006, 07:50 AM   #568 (permalink)
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Quote:
Originally Posted by willravel
The buildings fell at basically a free fall speed. Are you suggesting that the copllapsing debris and dust inside the building were moving fast that free fall speeds? Do you know how much pressure that would take?
I think you missed a few words in this post, but have you ever worked a bellows?

Your arms move slowly, the air moves very fast. This is because the air is channeled and under pressure. I don't know about you but I think several thosand pounds of falling concrete will create a good deal of pressure. Not to mention that as things break they will shatter at supersonic speeds due to the nature of crack propagation, which would shoot debris out VERY fast with 'explosive' force. Its why an instron machine needs a shield when testing materials in compression.

Edit:Pounds should be TONS
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Last edited by Ustwo; 09-18-2006 at 07:54 AM..
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Old 09-18-2006, 07:52 AM   #569 (permalink)
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Quote:
Originally Posted by Ustwo
I think you missed a few words in this post, but have you ever worked a bellows?

Your arms move slowly, the air moves very fast. This is because the air is channeled and under pressure. I don't know about you but I think several thosand pounds of falling concrete will create a good deal of pressure. Not to mention that as things break they will shatter at supersonic speeds due to the nature of crack propagation, which would shoot debris out VERY fast with 'explosive' force. Its why an instron machine needs a shield when testing materials in compression.
quite true, thanks for bringing that up, the idea of pressure is that it doesn't have to be for a long period of time but long enough for the subject to fail.
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Old 09-18-2006, 08:01 AM   #570 (permalink)
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No argument here, just flaming and a COMPLETE lack of evidence. Do you want to actually try and disprove the 1500C temp? Or don't you have a good argument?
Not a complete lack of evidence, it's been posted numerous time. I'm not riding his coat-tails, I've posted my evidence and you conspiracy theorists ignore them so I dont post them again.

So you're suggesting I post evidence that fire is not hot? That we can not melt steel with fire? How about I post evidence that fire occurs and is not simply a government conspiracy. Jet fuel burns hot. Mixed with paper, carpet, and all sorts of flamable things inside the building it's going to burn hotter. With a giant hole in the side of the building plenty of air will flow in to feed the fire. With concrete floors that heat energy will be concentrated, and the only thing for it to do is give it's heat to the building itself.

Quote:
Obviously not.

Notice the dust puffs several stories below the collapse.
So for that theory to hold true you'd see the flash effects of controlled demolitions along with the dust. You don't make explosions without a flash, it simply does not happen. Unfortunately for that theory there were no flashes, showing good evidence for the dust theory.
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Old 09-18-2006, 08:18 AM   #571 (permalink)
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Quote:
Originally Posted by Seaver
Not a complete lack of evidence, it's been posted numerous time. I'm not riding his coat-tails, I've posted my evidence and you conspiracy theorists ignore them so I dont post them again.
What you did was flame, and in that post you did not support your personal attack on Fatsom. Disagreement can happen without disrespect. I know you're a very intelligent and mature person, so I was surprised when I read your post. My response was intended to point out that you didn't actually have content in your post, just flame. That's not appropriate for TFP.
Quote:
Originally Posted by Seaver
So you're suggesting I post evidence that fire is not hot? That we can not melt steel with fire? How about I post evidence that fire occurs and is not simply a government conspiracy. Jet fuel burns hot. Mixed with paper, carpet, and all sorts of flamable things inside the building it's going to burn hotter. With a giant hole in the side of the building plenty of air will flow in to feed the fire. With concrete floors that heat energy will be concentrated, and the only thing for it to do is give it's heat to the building itself.
Jet fuel burns at 800° to 1500°F. I belive carpet, paper, desks, etc. burn much cooler than jet fuel (please, feel free to correct me if I'm wrong). Are you suggesting that the temperature at which jet fuel, carpet, paper, desks, chairs, houseplants, computers, etc. all burn is cumumlative? If so, that could explain the 1500C temperature, but it would lead me to a state of confusion that I may never come back from, as it goes against my basic understanding of the nature of fire.
Quote:
Originally Posted by Seaver
So for that theory to hold true you'd see the flash effects of controlled demolitions along with the dust. You don't make explosions without a flash, it simply does not happen. Unfortunately for that theory there were no flashes, showing good evidence for the dust theory.
*IF* demolitions explosives were used, then one could assume that they would be used in the interrior of the building, the rimary support of the building. This would help the building to fall into it's footprint, explain why the buyilding fell so fast, explain the way the outer supports exploded outwards, and a lack of flashes. Still, I am unconvinced. I don't know how the building collapsed, I am just prety sure I know how it didn't collapse. That's kinda the bottom line.

Quote:
Originally Posted by Ustwo
I think you missed a few words in this post, but have you ever worked a bellows?

Your arms move slowly, the air moves very fast. This is because the air is channeled and under pressure. I don't know about you but I think several thosand pounds of falling concrete will create a good deal of pressure. Not to mention that as things break they will shatter at supersonic speeds due to the nature of crack propagation, which would shoot debris out VERY fast with 'explosive' force. Its why an instron machine needs a shield when testing materials in compression.

Edit:Pounds should be TONS
I do understand that. What I don't understand is how that pressure was channeled out of a few windows instead of equally across several floors.

Last edited by Willravel; 09-18-2006 at 08:33 AM.. Reason: Automerged Doublepost
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Old 09-18-2006, 05:25 PM   #572 (permalink)
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[QUOTE=willravel]Jet fuel burns at 800° to 1500°F. I belive carpet, paper, desks, etc. burn much cooler than jet fuel (please, feel free to correct me if I'm wrong). Are you suggesting that the temperature at which jet fuel, carpet, paper, desks, chairs, houseplants, computers, etc. all burn is cumumlative? If so, that could explain the 1500C temperature, but it would lead me to a state of confusion that I may never come back from, as it goes against my basic understanding of the nature of fire.

Quote:
Originally Posted by popsci
But jet fuel wasn't the only thing burning, notes Forman Williams, a professor of engineering at the University of California, San Diego, and one of seven structural engineers and fire experts that PM consulted. He says that while the jet fuel was the catalyst for the WTC fires, the resulting inferno was intensified by the combustible material inside the buildings, including rugs, curtains, furniture and paper. NIST reports that pockets of fire hit 1832°F.
Quote:
Originally Posted by willravel
*IF* demolitions explosives were used, then one could assume that they would be used in the interrior of the building, the rimary support of the building. This would help the building to fall into it's footprint, explain why the buyilding fell so fast, explain the way the outer supports exploded outwards, and a lack of flashes. Still, I am unconvinced. I don't know how the building collapsed, I am just prety sure I know how it didn't collapse. That's kinda the bottom line.
You don’t need explosives to explain its speed; the building is nearly all air
Quote:
Originally Posted by popsci
Like all office buildings, the WTC towers contained a huge volume of air. As they pancaked, all that air--along with the concrete and other debris pulverized by the force of the collapse--was ejected with enormous energy.
More instances of conspiracy theorist getting there quote wrong.
Quote:
Originally Posted by popsci
Demolition expert Romero regrets that his comments to the Albuquerque Journal became fodder for conspiracy theorists. "I was misquoted in saying that I thought it was explosives that brought down the building," he tells PM. "I only said that that's what it looked like."
Quote:
Originally Posted by willravel
I do understand that. What I don't understand is how that pressure was channeled out of a few windows instead of equally across several floors.
Think of it this way, as soon as one window breaks, the pressure escapes through there, and there is no reason for the others to, how ever, the pressure was so great that it broke several before the pressure equalized.
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Old 09-18-2006, 05:34 PM   #573 (permalink)
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So the NIST says it could have gone as high as 1800F? Well that's still a far cry from 1500C (2732F).
Quote:
Originally Posted by Dilbert
You don’t need explosives to explain its speed; the building is nearly all air
Ah, but the parts of the building that are not air, namely the massive colunms, should have given massive resistence even to the weight of the collapsing building. The free fall speed suggests that the undamaged columns didn't give any resistence. That's quite impossible.
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Originally Posted by Dilbert
More instances of conspiracy theorist getting there quote wrong.
I'm sorry, when did I quote Romero? I'm more than aware of his flip floppage.
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Old 09-18-2006, 06:22 PM   #574 (permalink)
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Originally Posted by willravel
Ah, but the parts of the building that are not air, namely the massive colunms, should have given massive resistence even to the weight of the collapsing building. The free fall speed suggests that the undamaged columns didn't give any resistence. That's quite impossible.
so you would answer that a pound of lead falls faster than a pound of feathers?

Were you expecting some sort of movie type "pause" where the failing columns hold out long enough for another group of people can get out of the building?

Once structures fail they tend not to "hold up" or create any resistence. Otherwise, wouldn't they then need to put charges on ALL floors in order to demo buildings?
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Old 09-18-2006, 06:34 PM   #575 (permalink)
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Quote:
Originally Posted by Cynthetiq
so you would answer that a pound of lead falls faster than a pound of feathers?
It's amazing how much that doesn't have anything to do with anything. Did the WTC fall in a vaccume? Of course not, so that question really isn't relevent.
Quote:
Originally Posted by Cynthetiq
Were you expecting some sort of movie type "pause" where the failing columns hold out long enough for another group of people can get out of the building?
I was expecting it to fall at less than free fall speed. I was also expecting you to be able to have a discussion without massive doses of sarcasm. You do realize that sarcasm hurts your arguments, right?
Quote:
Originally Posted by Cynthetiq
Once structures fail they tend not to "hold up" or create any resistence. Otherwise, wouldn't they then need to put charges on ALL floors in order to demo buildings?
Demolition: the bottom middle gets destroyed first, then the bottom outside, then the middle and top. If the bottom were not destroyed first, the building collapse would meet with resistence and could fall outside of it's footprint. Both towers fell into their footprints.
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Old 09-18-2006, 06:39 PM   #576 (permalink)
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again, once the structure object under pressure fails, the rest of it is pretty simple.

Regardless of the way it is imploded, the resistance is still the same is it not? A building in demolition is falling at nearly free fall speeds once the structural support is compromised.
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Old 09-18-2006, 06:45 PM   #577 (permalink)
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Quote:
Originally Posted by willravel
So the NIST says it could have gone as high as 1800F? Well that's still a far cry from 1500C (2732F).

fastom, who I was originally arguing with, did not state F or C, I assumed he meant F.

Quote:
Originally Posted by willravel
Ah, but the parts of the building that are not air, namely the massive colunms, should have given massive resistence even to the weight of the collapsing building. The free fall speed suggests that the undamaged columns didn't give any resistence. That's quite impossible.
Well no. the undamaged columns did offer resistance, a lot of it, how ever, the force of a collapsing building is orders of several orders of magnitude bigger

A static load is very different than a dynamic load, the weight of the above tower at rest is very different than when it fell one story, after falling 10-20 feet it exerts much more force than when it is stationary. Place a bowling ball on your foot, it will be very heavy, but not break anything, now drop it 1 inch onto your foot, it hurts like a bitch huh, now 6 inches, then 1 foot, then 2 foot, keep doing this until you realize that the higher it falls the force exerted increases exponentially. Nothing, and I mean Nothing could stop that many floors from dropping.

Quote:
Originally Posted by willravel
I'm sorry, when did I quote Romero? I'm more than aware of his flip floppage.
Never, just showing that a lot of the conspiracy websites are based off of false statements
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Old 09-18-2006, 06:53 PM   #578 (permalink)
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Originally Posted by Dilbert1234567
fastom, who I was originally arguing with, did not state F or C, I assumed he meant F.
Quote:
Originally Posted by Dilbert1234567
I would agree that it was closer to 1500C
As I understood your point, you were assuming a temperature close to 1500C (2732F). That's simply not the case.
Quote:
Originally Posted by Dilbert1234567
Well no. the undamaged columns did offer resistance, a lot of it, how ever, the force of a collapsing building is orders of several orders of magnitude bigger
Wouldn't the load of the crashing debris be decreased by the fact that it was demolishing and breaking into smaller pieces as it came down? Do you think that we can actually work out some rough math to compare weight with resistence?
Quote:
Originally Posted by Dilbert1234567
/snip static vs. dynamic load
I understand the difference between static and dynamic loads.
Quote:
Originally Posted by Dilbert1234567
Never, just showing that a lot of the conspiracy websites are based off of false statements
Well I think this will be easier if we work on a case-by-case basis. The point/counterpoint type of discussion seems to be more likely to bear fruit. There are so many stories coming from so many people on both sides that assuming there are only two sides to this is incorrect. I can't be grouped with all conspiracy theorists because some of them blame the illuminati or aliens for the collapse. I see no evidence of this, of course. Likewise, you can't be grouped with all anti-conspiracy people because there are several official explainations out there. FEMA and NIST disagree on many points,for example.

Quote:
Originally Posted by Cynthetiq
Regardless of the way it is imploded, the resistance is still the same is it not? A building in demolition is falling at nearly free fall speeds once the structural support is compromised.
Comparing the theoretical situations at the WTC with demolitions:

Demo: First thing to go is the bottom supports in the building.
-the bottom of the building always has the strongest supports, as it is designed to take the full weight of the building.
-removing the bottom supports first ensures that as the building collapses it has little to no resistence from the frame.
-immediatally after the bottom of the building loses strength, then the middle and top are destroyed to ensure that the building will not fall anywhere but inside it's footprint.
-very few demolitions fall at free fall speeds. Many of them are close, but those are usually smaller.

WTC: The collapses started at the upper middle and top, with no structural strength loss at the lower middle or bottom of the building
-the strongest supports would still have been intact when the building collapsed, which would offer resistence, but more importantly that would cause the building to be more likely to fall well outside of it's footprint
-the building had experienced only moderate fires for a very limited amount of time
-it fell at free fall speed, and the WTC are the largest buildings to collapse in history

Last edited by Willravel; 09-18-2006 at 07:02 PM.. Reason: Automerged Doublepost
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Old 09-18-2006, 07:30 PM   #579 (permalink)
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are there facts for it being timed at free fall speeds?

what i witnessed did not look much different than the speeds of buildings I've seen implode in Las Vegas.
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Old 09-18-2006, 07:35 PM   #580 (permalink)
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Quote:
Originally Posted by willravel
As I understood your point, you were assuming a temperature close to 1500C (2732F). That's simply not the case.
Eh? No, please don’t take my out of context, it makes me mad.

Quote:
Originally Posted by Dilbert1234567
I would agree that it was closer to 1500C, but I use 500C as a low bound I’m sure it was hotter then that, and 500C is all the heat I need on the beam to show a good cause of the failure of the building.
First this quote was when you said it was 1500C, and I agreed, then I recognized I meant F
Quote:
Originally Posted by Dilbert1234567
It’s hard to agree on a temperature, in any investigation, it needs to be a range of possibilities, at least 500C, but no more than 1500C
Quote:
Originally Posted by Dilbert1234567
correct, but I don’t think the beam reached 1500C, from what I’ve read it was about half as hot as that.
If you nit pick my statements, you can make me say anything, context is what is important

Quote:
Originally Posted by willravel
Wouldn't the load of the crashing debris be decreased by the fact that it was demolishing and breaking into smaller pieces as it came down? Do you think that we can actually work out some rough math to compare weight with resistence?
Resistance would be impossible to work out; however, the amount of force compared to the resistance is like a bowling ball and a wet paper towel.

Quote:
Originally Posted by willravel


WTC: The collapses started at the upper middle and top, with no structural strength loss at the lower middle or bottom of the building
-the strongest supports would still have been intact when the building collapsed, which would offer resistence
Yes, but as previously said, the amount of resistance is mute, it’s too small to stop the upper floors from crashing down and destroying the rest of the building.

I have a physics midterm to study for; I think this is my last post for the day.


Quick note to cynthetiq, the speed of collapse was just slightly longer than a freefall.

I’ll crunch some numbers to find the experimentally derived resistance the tower experienced to fall in the time it did.
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Old 09-18-2006, 07:41 PM   #581 (permalink)
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Originally Posted by Dilbert1234567
First this quote was when you said it was 1500C, and I agreed, then I recognized I meant F.
I figured that you corrected the post, then I read the other one. Simple misunderstanding. So now we agree, the absolute hottest is 1800F, and it was probably less.
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Originally Posted by Dilbert1234567
Resistance would be impossible to work out; however, the amount of force compared to the resistance is like a bowling ball and a wet paper towel.
Tens of thoseands of tons of hardened and brilliantly designed steel framing is equatable to a wet paper towel? Didn't you just get finished saying resistence would be impossible to work out?
Quote:
Originally Posted by Dilbert1234567
Yes, but as previously said, the amount of resistance is mute, it’s too small to stop the upper floors from crashing down and destroying the rest of the building.
How can the resistence be moot if we don't know the resistence?
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Old 09-18-2006, 09:12 PM   #582 (permalink)
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Originally Posted by willravel
Tens of thoseands of tons of hardened and brilliantly designed steel framing is equatable to a wet paper towel? Didn't you just get finished saying resistence would be impossible to work out?

How can the resistence be moot if we don't know the resistence?

Quote:
Originally Posted by http://www.tms.org/pubs/journals/JOM/0112/Eagar/Eagar-0112.html
Nearly every large building has a redundant design that allows for loss of one primary structural member, such as a column. However, when multiple members fail, the shifting loads eventually overstress the adjacent members and the collapse occurs like a row of dominoes falling down.

The perimeter tube design of the WTC was highly redundant. It survived the loss of several exterior columns due to aircraft impact, but the ensuing fire led to other steel failures. Many structural engineers believe that the weak points—the limiting factors on design allowables—were the angle clips that held the floor joists between the columns on the perimeter wall and the core structure (see Figure 5). With a 700 Pa floor design allowable, each floor should have been able to support approximately 1,300 t beyond its own weight. The total weight of each tower was about 500,000 t.

As the joists on one or two of the most heavily burned floors gave way and the outer box columns began to bow outward, the floors above them also fell. The floor below (with its 1,300 t design capacity) could not support the roughly 45,000 t of ten floors (or more) above crashing down on these angle clips. This started the domino effect that caused the buildings to collapse within ten seconds, hitting bottom with an estimated speed of 200 km per hour. If it had been free fall, with no restraint, the collapse would have only taken eight seconds and would have impacted at 300 km/h.1 It has been suggested that it was fortunate that the WTC did not tip over onto other buildings surrounding the area. There are several points that should be made. First, the building is not solid; it is 95 percent air and, hence, can implode onto itself. Second, there is no lateral load, even the impact of a speeding aircraft, which is sufficient to move the center of gravity one hundred feet to the side such that it is not within the base footprint of the structure. Third, given the near free-fall collapse, there was insufficient time for portions to attain significant lateral velocity. To summarize all of these points, a 500,000 t structure has too much inertia to fall in any direction other than nearly straight down.
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Old 09-18-2006, 11:38 PM   #583 (permalink)
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are there facts for it being timed at free fall speeds?

what i witnessed did not look much different than the speeds of buildings I've seen implode in Las Vegas.
Remarkable similarity, no? And the buildings in Vegas were not hit with airplanes at all. You don't s'pose somebody blowed 'em up?

I don't think it was 1500 F at all. I'm not sure how NIST figures 1832 degrees how did they sample that?
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Old 09-19-2006, 05:15 AM   #584 (permalink)
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Originally Posted by fastom
Remarkable similarity, no? And the buildings in Vegas were not hit with airplanes at all. You don't s'pose somebody blowed 'em up?
free fall speeds:
Quote:
Originally Posted by http://wtc.nist.gov/pubs/factsheets/faqs_8_2006.htm
6. How could the WTC towers collapse in only 11 seconds (WTC 1) and 9 seconds (WTC 2)—speeds that approximate that of a ball dropped from similar height in a vacuum (with no air resistance)?

NIST estimated the elapsed times for the first exterior panels to strike the ground after the collapse initiated in each of the towers to be approximately 11 seconds for WTC 1 and approximately 9 seconds for WTC 2. These elapsed times were based on: (1) precise timing of the initiation of collapse from video evidence, and (2) ground motion (seismic) signals recorded at Palisades, N.Y., that also were precisely time-calibrated for wave transmission times from lower Manhattan (see NCSTAR 1-5A).

As documented in Section 6.14.4 of NIST NCSTAR 1, these collapse times show that:

“… the structure below the level of collapse initiation offered minimal resistance to the falling building mass at and above the impact zone. The potential energy released by the downward movement of the large building mass far exceeded the capacity of the intact structure below to absorb that energy through energy of deformation.

Since the stories below the level of collapse initiation provided little resistance to the tremendous energy released by the falling building mass, the building section above came down essentially in free fall, as seen in videos. As the stories below sequentially failed, the falling mass increased, further increasing the demand on the floors below, which were unable to arrest the moving mass.”

In other words, the momentum (which equals mass times velocity) of the 12 to 28 stories (WTC 1 and WTC 2, respectively) falling on the supporting structure below (which was designed to support only the static weight of the floors above and not any dynamic effects due to the downward momentum) so greatly exceeded the strength capacity of the structure below that it (the structure below) was unable to stop or even to slow the falling mass. The downward momentum felt by each successive lower floor was even larger due to the increasing mass.

From video evidence, significant portions of the cores of both buildings (roughly 60 stories of WTC 1 and 40 stories of WTC 2) are known to have stood 15 to 25 seconds after collapse initiation before they, too, began to collapse. Neither the duration of the seismic records nor video evidence (due to obstruction of view caused by debris clouds) are reliable indicators of the total time it took for each building to collapse completely.

Quote:
Originally Posted by fastom
I don't think it was 1500 F at all. I'm not sure how NIST figures 1832 degrees how did they sample that?
Quote:
Originally Posted by http://wtc.nist.gov/pubs/NISTNCSTAR1-5FDraft.pdf page 39
…Six experiments were performed within the compartment, of which five were simulated because Tests 1 and 2 were replicate tests. Figures 4–6 and 4–7 show pictures of an actual test and a corresponding simulation. Both the heat release rate and the compartment temperatures were compared. Figure 4–8 displays comparison plots of measured and predicted heat release rates. Figure 4–9 displays the upper layer temperature for Test 1 at four locations (clockwise from upper left: near window, between workstations, behind workstations, rear wall). The measured and predicted temperatures for all the tests were similar to those shown in Fig. 4–9. Peak temperatures near the compartment opening were about 1,000 °C, decreasing to 800 °C at the very back of the compartment. The trend was captured in the simulations. The decrease in temperature was important because in the simulations of the WTC fires, the only basis of comparison was the visual observations of fires around the exterior of the buildings. It was important to demonstrate that the model not only predicted accurately the temperature near the windows, but also the decrease in temperature as a function of distance from the windows. The temperature predictions for the other tests were similar and are included in NIST NCSTAR 1-5E….
They know the temperatures reached 1000C because they ran test to simulate the conditions, both physically and through computer simulations, both came up with a high bound of 1000C. instead of saying ‘I don’t know so they musty be lying about it’ try doing some real reassearch findng how they knew it
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Old 09-19-2006, 05:34 AM   #585 (permalink)
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Originally Posted by fastom
Remarkable similarity, no? And the buildings in Vegas were not hit with airplanes at all. You don't s'pose somebody blowed 'em up?
No I don't.

It may APPEAR similar but that's because from what I understand of physics things fall at the same rate and speed. Once the building structure was compromised, the collapse was similar to me.
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Old 09-19-2006, 07:00 AM   #586 (permalink)
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Why are you arguing with someone who couldn't pass physics 101?

Debate requires a baseline understanding of the issues and you have shown that fastom lacks that understanding many times over.
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Old 09-19-2006, 07:04 AM   #587 (permalink)
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Originally Posted by Ustwo
Why are you arguing with someone who couldn't pass physics 101?

Debate requires a baseline understanding of the issues and you have shown that fastom lacks that understanding many times over.
actually I didn't pass physics 101 either. It's taken me years to make up for it, thank goodness for simulations because I had a hard time visualizing it all which is why I failed the class in high school.
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Old 09-19-2006, 07:17 AM   #588 (permalink)
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Originally Posted by Cynthetiq
actually I didn't pass physics 101 either. It's taken me years to make up for it, thank goodness for simulations because I had a hard time visualizing it all which is why I failed the class in high school.
But I'll assume you understood concepts of thermal expansion and KE=1/2 MV^2. Using physics 101 may have been a bad example, but the basic concepts are whats at issue here, not the ability to determine the angle a cannon needs to be fired for a projectile to travel X feet, which is the stuff of physics 101.
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Old 09-19-2006, 02:29 PM   #589 (permalink)
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Quote:
Originally Posted by Ustwo
Why are you arguing with someone who couldn't pass physics 101?

Debate requires a baseline understanding of the issues and you have shown that fastom lacks that understanding many times over.
I tutor students in physics, so seeing all the misconceptions here it better prepares me to deal with the students. Cynthetiq, if you’re ever trying again and have questions, let me know I’d be glad to help you.
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Old 09-19-2006, 03:32 PM   #590 (permalink)
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I tutor students in physics, so seeing all the misconceptions here it better prepares me to deal with the students. Cynthetiq, if you’re ever trying again and have questions, let me know I’d be glad to help you.
I tutor kids at piano lessons, but unless we get into acoustics I guess it's notm relevant. Oh well.
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Old 09-19-2006, 03:46 PM   #591 (permalink)
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I tutor kids at piano lessons, but unless we get into acoustics I guess it's notm relevant. Oh well.
I'm sure there was some acoustic tile in WTC? /sarcasm

BTW, I was reading my other post, and I wasn't trying to be sarcastic, slightly snarky I admit it came out, but was trying to elicit a response as to what your expectation was.
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Old 09-19-2006, 05:16 PM   #592 (permalink)
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I tutor kids at piano lessons, but unless we get into acoustics I guess it's notm relevant. Oh well.
that’s why your so patient like me.
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Old 09-20-2006, 10:56 PM   #593 (permalink)
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I guess we just see things differently.
If we both saw a man jump off a bridge we'd probably gasp as we watched him fall. When he started slowing then stopped short of the ground then began to rise up again we'd analyse what we saw.

You'd come up with some fancy physics that say his body was in shock which caused him to lose enough weight to slow his fall and his screams made warm air pockets and the inversion lifted him back up.

Me, i'd notice the rubber cord around his ankles.
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Old 09-21-2006, 04:43 AM   #594 (permalink)
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Originally Posted by fastom
I guess we just see things differently.
If we both saw a man jump off a bridge we'd probably gasp as we watched him fall. When he started slowing then stopped short of the ground then began to rise up again we'd analyse what we saw.

You'd come up with some fancy physics that say his body was in shock which caused him to lose enough weight to slow his fall and his screams made warm air pockets and the inversion lifted him back up.

Me, i'd notice the rubber cord around his ankles.
Yeah, right. because physics is made-up voodoo gobbledeegook, while your observations are infallible. Great analogy, way to ignore the evidence. You're going to be a great success one day!
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Old 09-21-2006, 05:37 AM   #595 (permalink)
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Quote:
Originally Posted by fastom
I guess we just see things differently.
If we both saw a man jump off a bridge we'd probably gasp as we watched him fall. When he started slowing then stopped short of the ground then began to rise up again we'd analyse what we saw.

You'd come up with some fancy physics that say his body was in shock which caused him to lose enough weight to slow his fall and his screams made warm air pockets and the inversion lifted him back up.

Me, i'd notice the rubber cord around his ankles.
so now you are implying that those who are using physics as part of their understanding means they completely miss obvious bungie cords? that's just completely absurd.
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Old 09-21-2006, 05:49 AM   #596 (permalink)
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Fatsom is kinda right. We've been dancing around this the whole time, but he's right. Example? The 1800F temperature is based on the maximum temperatures possible for a fire fueled by jet fuel, desks, chairs, paper, drapes, etc. It almost certianally wasn't that hot. Eyewhitness reports talk about how the fire was dying down as much as 20 minutes before the collapse. Cheif Palmer, on the 78th floor of the South tower (the one that fell fastest, and yet most of the fuel spilled out and exploded outside the building), [I]from the crash zone[/URL], said there were "two isolated pockets of fire" when he called for backup and requested 2 hoses to put them out. Reports like this one come from firefighters that were inside the building putting the fires out, and I'd imagine firefighters know a thing or two about the behavior of fire. Remember, jet fuel burns between 800F and 1500F, which suggests that it's more than posible that they were burning at 800F. They could have been burning at 400F, considering that most of the jet fuel burned off in the initial explosion. Not even Dilbert could make the buiding fall with 800F fires. Even with a 1500F fire, it's a real stretch explaining the collapse of the building. It has to assume most of the fire protection was stripped fom the steel. Some of the fire protection was stripped by the crash itself, of course, but it's not like all the fire protection from the whole floor was lost across several floors. You'd need to have ideal circumstances for a 1500F fire that was consistanly hot to heat the uncovered steel to a temperature where it started to lose any of it's tensile strength. I'll tell you what, let's split the difference and say that the fire burned at 1150F. Add to that the heat from the fires on the desks, chairs, paper, drapes, etc. (even though the temperature of a fire is not a cumulative number based on the emperatures of the individual fires), and we'll say about 1350F. And that 1350F temperature did not last a full hour. It started cold, built up to hot, then dropped off and went down again. Those are hardly the ideal situations that NISA, FEMA, Dilbert, and PopMech suggest. Oh, and if you want proof that PopMech isn't reliable, check out what they are saying about 9/11 cough, a condition that effects thousands of rescue workers and brave civilians who dug through the rubble to find survivors. Yikes. Talk about disrespecting the heros of 9/11. I can't belive that Popular Mechanics can't figure out that pulverized cement in the air is toxic. 70% of 9/11 recovery workers suffer from severe lung problems.
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Old 09-21-2006, 06:20 AM   #597 (permalink)
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Quote:
Those are hardly the ideal situations that NISA, FEMA, Dilbert, and PopMech suggest. Oh, and if you want proof that PopMech isn't reliable, check out what they are saying about 9/11 cough, a condition that effects thousands of rescue workers and brave civilians who dug through the rubble to find survivors. Yikes. Talk about disrespecting the heros of 9/11. I can't belive that Popular Mechanics can't figure out that pulverized cement in the air is toxic. 70% of 9/11 recovery workers suffer from severe lung problems.
I believe the aspestos has a lot to do with it too.
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Old 09-21-2006, 06:36 AM   #598 (permalink)
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by that same "dancing" I can easily say that the WTC core center structure was hit by a plane that was travelling at 500+MPH and that in and of itself was compromised, the fuel fires themselves just added a small component. The same plane which heavily damaged the Pentagon which is a reinforced building supposedly designed to survive military strikes was able to do as much damage to the WTC which was not designed to withstand such an onslaught.

Isn't that the same kind of thing just different perspective or dancing position?
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Old 09-21-2006, 06:41 AM   #599 (permalink)
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by that same "dancing" I can easily say that the WTC core center structure was hit by a plane that was travelling at 500+MPH and that in and of itself was compromised,
You can state that it was compromised, but that doesn't make it true. Bear in mind that the WTC was designed to withstand impacts from aircraft, aircraft not much smaller than the plane that hit. The building dropped in just under and just over an hour each.
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Old 09-21-2006, 06:59 AM   #600 (permalink)
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Quote:
Originally Posted by fastom
I guess we just see things differently.
If we both saw a man jump off a bridge we'd probably gasp as we watched him fall. When he started slowing then stopped short of the ground then began to rise up again we'd analyse what we saw.

You'd come up with some fancy physics that say his body was in shock which caused him to lose enough weight to slow his fall and his screams made warm air pockets and the inversion lifted him back up.

Me, i'd notice the rubber cord around his ankles.
So you noticed the explosives, that slowly bowed the outer supports over the final last minutes of the buildings until they finally gave way and collapsed. Yup. That’s how explosives work all right, slow and constant over a few minutes.




Quote:
Originally Posted by willravel
Fatsom is kinda right. We've been dancing around this the whole time, but he's right. Example? The 1800F temperature is based on the maximum temperatures possible for a fire fueled by jet fuel, desks, chairs, paper, drapes, etc. It almost certianally wasn't that hot. Eyewhitness reports talk about how the fire was dying down as much as 20 minutes before the collapse.
No fastom is not right. 1800F is the maximum temperature that jet fuel can burn, but other materials inside a building can burn much hotter, carpets, glue’s, and other hydro carbons can burn much hotter, as well as other exotic materials. But were not truly worried about temperature as we are with the amount of heat energy being transferred, there was a lot of combustible material in the towers and I completely disagree with the notion that the fires were dying done, there is no way to judge a fires oxygen supply based off of the smoke, that’s total baloney. You forget we have fire fighters saying, the building looks like it was going to collapse as they saw the sides start to buckle about 20 minutes before the collapse.

Quote:
Originally Posted by http://www.representativepress.org/BowingDebunksExplosives.html
`it's not going to take long before the north tower comes down.'' This was 20 minutes before it collapsed. In another radio transmission at 10:21 a.m., the officer said he saw buckling in the north tower's southern face, Shyam Sunder said."
Quote:
Originally Posted by http://www.representativepress.org/BowingDebunksExplosives.html
"The NYPD aviation unit reported critical information about the impending collapse of the buildings." They could see that the exterior steel beams of the buildings were bowing.
Quote:
Originally Posted by http://www.representativepress.org/BowingDebunksExplosives2.html
Before the collapse of either tower, evidence the structures of the WTC were failing was reported by Police, Firemen and civilians. As already mentioned, flying around outside the WTC, the NYPD helicopters reported "an inward bowing of the buildings' columns in the minutes before they collapsed." Inside WTC 1, New York City Fire Department's Assistant Chief Joseph Callan realized the building was in trouble even before the first building, building two, collapsed. Interviewed Nov. 2, 2001, Assistant Chief Callan told New York City Fire Marshal Michael Starace, "Approximately 40 minutes after I arrived in the lobby, I made a decision that the building was no longer safe. And that was based on the conditions in the lobby, large pieces of plaster falling, all the 20 foot high glass panels on the exterior of the lobby were breaking. There was obvious movement of the building, and that was the reason on the handy talky I gave the order for all Fire Department units to leave the north tower. Approximately ten minutes after that, we had a collapse of the south tower, and we were sort of blown up against the wall in the lobby of the north tower, and we gathered together those of us who were still able to."

Callan's warnings about the north tower, WTC 1, reached the Office of Emergency Management, OEM. Other people learned from OEM that the WTC buildings were going to collapse. EMT Richard Zarrillo was told to deliver the message. In an Oct 25, 2001 interview Zarrillo explianed, "I said the buildings are going to collapse; we need to evac everybody out. With a very confused look he said who told you that? I said I was just with John at OEM. OEM says the buildings are going to collapse; we need to get out. ... I said, listen, I was just at OEM. The message I was given was that the buildings are going to collapse; we need to get our people out. At that moment, this thunderous, rolling roar came down and that's when the building came down, the first tower came down." 9110161.PDF http://nistreview.org/histories.php

At 9:37, a civilian on the 106th floor of the South Tower reported to a 911 operator that a lower floor-the "90-something floor"-was collapsing. - "The 9/11 Commission Report" p304
If it were explosives, it would have been a sudden transformation from stable to collapse, but we have multiple witnesses, pictures, and credible experts (the firefighters, and the assistant fire chief) saying the building was bowing and moving towards collapse.

Quote:
Originally Posted by willravel
Oh, and if you want proof that PopMech isn't reliable, check out what they are saying about 9/11 cough, a condition that effects thousands of rescue workers and brave civilians who dug through the rubble to find survivors. Yikes. Talk about disrespecting the heros of 9/11. I can't belive that Popular Mechanics can't figure out that pulverized cement in the air is toxic. 70% of 9/11 recovery workers suffer from severe lung problems.
Well you’ve got me stumped, I can’t find where in the article, or anywhere on the internet you have popular mechanics says the cough is wrong. Even if they did, I’m sure what they said was taken out of context; you can’t just ignore an organization with decades of good, credible research for one mistake. Please back your statement.

I’ve got a physics midterm, in 1 hour, I’d write more, but I don’t want fastoms ‘fisics’ clouding my mind.
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