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Invitation to Derek Johnson to discuss his ideas

Why was it the strongest and heavies column?
I am sure the answer will occur to you immediately. It is really easy.

Wasn't it something like column 79 stuck out through the roof of WTC7 and a massive steel plate was welded on top. And on that plate the Penthouse was built ? Meaning that column 79 supported the Penthouse ?
 
This is almost as amazing as the theory of thermal expansion.
Now an item falling at g is being forced downwards faster than g by another object that is presumably falling faster than g itself.

Sounds magical, but isn't.

Very simple experiment:

Take a ruler, or any other long, slender, fairly rigid object you may have at hand. Maybe you got a piece of wooden slat. whatever.

Rest one end on the edge of your desk. Make sure you have one or two inches of it on the desktop.
Hold the other up with your finger, so the ruler stays horizontally above the floor.
Pull away finger, so ruler falls to floor.

You will notice of course that, for a while, one end of the ruler does not fall at all for a while (the end resting on the desk; in fact, the very end goes up!) - acceleration is 0.
Question: What is the acceleration to the other (free) end? If your intuition tells you "g", you are wrong.
If your intuition tells you "<g", you are even wronger!
The acceleration of the free end is actually >g!
Amazing, right? Unbelievable, even?

Here is how you can prove it:
Do the experiement again, but this time, place a coin or some other dense object on the middle of the ruler.
You will noice that the coin will stay in contact with the ruler for a while, indicating that the middle of the ruler is accelerated by no more than g (actually less).
Do the experiment again, this time with a coin at the lose end!
Watch carefully: Rule and coin will separate, and the end of the ruler falls faster than the coin, which falls freely!

Since the coin falls at g, the end ot the rule falls faster than g!



I suggest both Bill and Derek play with their ruler and a coin all night long.
They may learn a little about Newton.
 
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Two objects are both falling at g, yet one is moving faster than the other. Impossible!

A deep Newton-defying mystery to Truthers, "Duh, one started falling before the other one" to everyone else. Of course, Newton would know better than to read g as a velocity, so there might indeed be some kind of Newton-free zone somewhere around here.

Respectfully,
Myriad

Is that really so Myriad ? Two objects are falling at g and yet one is falling faster than the other ?

Is this a quantum riddle of yours you rascal ?
 
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Wasn't it something like column 79 stuck out through the roof of WTC7 and a massive steel plate was welded on top. And on that plate the Penthouse was built ? Meaning that column 79 supported the Penthouse ?

Good boy!
 
I'm still waiting for my anwsers from you.

Where are they?

It is very telling which posts you reply to, and which not.

You could as well have replied to

Two objects are both falling at g, yet one is moving faster than the other. Impossible!

A deep Newton-defying mystery to Truthers, "Duh, one started falling before the other one" to everyone else. Of course, Newton would know better than to read g as a velocity, so there might indeed be some kind of Newton-free zone somewhere around here.

Respectfully,
Myriad

Or

Derek, if you think that eye witnesses know molten steel when they see it, then surely you will be able to pass this test:

Exhibit #1:
http://farm1.static.flickr.com/120/293967938_fefbfba958.jpg?v=0
What is it?

Exhibit #2:
http://cache.io9.com/assets/images/io9/2008/08/79060530.jpg
What is it?

Exhibit #3:
http://www.lawrenceport.com/images/chuquiLiquid.jpg
What is it?

Exhibit #4:
http://www.jameslockman.com/jamesblog/down_the_hole.jpg
What is it?

Exhibt #5:
http://gallery.usgs.gov/images/05_26_2009/nr2Tlx8KKf_05_26_2009/medium/Drip2.JPG
What is it?

Exhibit #6:
http://farm1.static.flickr.com/141/368337809_e92e87064f.jpg?v=0
What is it?

Exhibit #7:
http://www.amemco.us/exported photos/foundry.gif
What is it?

Or

The entire molten-steel-argument has several steps, and each step must be shown to be correct for it to mean anything with regard to the collapse of a building:

Step 1: It is true that witnesses reported the presence of molten steel in the trash heap

Step 2: There are methods available to these witnesses to accurately identify the material as molten steel (both the "molten" and the "steel" are of course necessary)

Step 3: It can be shown that the witness arrived at his conclusion by such a valid method

Step 4: We conclude from the presence of molten steel in the trash heap at some time after the collapse that it had a temperature of T then.

Step 5: There is nothing that happens in the trash heap of a building that collapsed do to office fires that could heat steel to temperature T

Step 6: We conclude that something unusual must have heated the steel such that it had at least temperature T when it was observed some time after the collapse

Step 7: We formuate a hypothesis of what that something unusual was and show that it would not only explain temperature T some time after the collapse, but would also provide a realistic method to intentionally demolish the building

Step 8: No other known observation falsifies that theory



We find that Step 1 is weak (we have to discard several alleged witness testimonies, but I think we can agree that at least some witness has reported molten steel

Step 2 and 3 are completely without any support from Derek, and that's where the entire chain of evidence is already broken

Step 4 could be reasonably done, if 2 and 3 were shown to be valid

Step 5 is more difficult - it is not at all clear that some steel alloys, after being subjected to all kinds of environmental influences found in a trash heap, could not be molten by some fires that are possible in such a trash heap

Step 6: Once we have verified 1-5, step 6 follows

Step 7: Entirely missing. That's what I kept asking at the beginning of our disussion after Derek entered: What IS this fabled hypothesis? Thermite? How would you demolish a building with thermite, and how would this same thermite continue to melt steel for days and weeks?

Step 8: Impossible as long as we have no theory.


So the whole molten-steel argument is weak both at its beginning and end, and broken in three separate places along the way.
That's a lot of explaining Derek has to do. Or he might declare that he rather retire this argument and purge it from any and all presentations in the future.

Or indeed

...
Lesson #1. You will never arrive at the right answer unless you carefully, precisely state the question.

NOBODY, except truthers (including you), has said "4000 tons of steel from floors 7-14 offered no resistance to the 1G descent for 2.25 seconds..."

Let's see you give it another try.

Restate the question. PRECISELY.

Then we'll dissect it. And I'll show you where you've gone wrong.


tom

PS. Wimps & charlatans will take what I've written, get their panties all in a bunch and run away crying about "disrespect" & "self-esteem".

People who hope to be engineers some day will stand up, take their licks & address the technical issues.

Let's see what you do...

Very very dishonest this all.

Jesus must be very proud of you.
 
I've answered them. And I'll answer them again.

No you have not and we are 27 pages into this thread. Images of various molten compounds have been provided for you in multiple posts throughout this thread. Oystein has repeatedly requested that you identify the different substances and as of yet you have not. Why haven't you? I think both of us know the answer, don't we?


He's showing me what looks like bronze or copper alloys. I've melted bronze in a cupola, but mostly steel. He's suggesting otherwise, but the two have a different appearance....dross forms differently, etc.

So each picture is that of a bronze or copper alloy?


His problems, and the problem with the premise of the questions is contained in my question #5. Will you be brave and answer it? You better believe it is a setup.

Do you even know why he is asking you to identify these metals?

I do.


It appears that a lot of people witnessed molten metal, many of these, including firefighters said "molten steel" and seemed sure of using the term.

Snip>>>>>>>>>>>> the rest of the post is irrelevant.


So you're admitting there was a mistake in your presentation then?

Or did you err in this thread?

Would you agree that "Molten Steel" and "Molten Metal" are two different things?

1. ...How did NIST ever land on "The first APPEARED to be...." (re: WTC 7 steel (so FEMA stated but NIST now denies) sample in FEMA App C)? Explain this please.

2. ...Tell me your hypothesis on the apparent (so you imply) "no energy dissipation" through this WTC 7 column steel.

3. ...How did those WTC 7 floor 13 framing beams both buckle and push the intersecting 79 to 44 girder (with or without shear studs, depending on which NIST report you read) off its seat @ column 79? How exactly?

4. ...Help me to understand why NIST is withholding the WTC 7 contract and ancillary construction docs from Ron Brookman S.E., and is denying his FOIA attempts to procure 3,370 files that include: 1. Remaining input and all results files of the ANSYS (FEA) 16-story Case B collapse initiation model. 2. Break element source code, 3. ANSYS scripts files for the break elements, 4. Custom executable ANSYS file, 5. All spreadsheets and other supporting calculations used to develop floor connection failure modes and capacities, and 6. Connection models....why withhold all this?

5. ...And what were the fractions of WTC 7 metal (example 96% Steel, 2% Aluminum, 1% Copper and so forth)? Doesn't have to be precise, ballpark will make my point very well, thank you.

I will answer these in a separate post.
 
Sounds magical, but isn't.

Very simple experiment:

Take a ruler, or any other long, slender, fairly rigid object you may have at hand. Maybe you got a piece of wooden slat. whatever.

Rest one end on the edge of your desk. Make sure you have one or two inches of it on the desktop.
Hold the other up with your finger, so the ruler stays horizontally above the floor.
Pull away finger, so ruler falls to floor.

You will notice of course that, for a while, one end of the ruler does not fall at all for a while (the end resting on the desk; in fact, the very end goes up!) - acceleration is 0.
Question: What is the acceleration to the other (free) end? If your intuition tells you "g", you are wrong.
If your intuition tells you "<g", you are even wronger!
The acceleration of the free end is actually >g!
Amazing, right? Unbelievable, even?

Here is how you can prove it:
Do the experiement again, but this time, place a coin or some other dense object on the middle of the ruler.
You will noice that the coin will stay in contact with the ruler for a while, indicating that the middle of the ruler is accelerated by no more than g (actually less).
Do the experiment again, this time with a coin at the lose end!
Watch carefully: Rule and coin will separate, and the end of the ruler falls faster than the coin, which falls freely!

Since the coin falls at g, the end ot the rule falls faster than g!



I suggest both Bill and Derek play with their ruler and a coin all night long.
They may learn a little about Newton.

I only have two rulers . What if I lay them one upon the other ? Will they seperate at the loose end and if not why not ?
 
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I only have two rulers . What if I lay them one upon the other ? Will they seperate at the loose emd and if not why not ?

If you have no coins, then bills will work just as fine. Maybe not as convincing, but hey...
 
Good boy!

I guess it must be like I said because in any other situation column 79 did not support the Penthouse. It was just one of several columns and beams etc supporting the Penthouse. So there is no good reason for this 350 ton column to collapse from mere office fires is there ?
 
If you have no coins, then bills will work just as fine. Maybe not as convincing, but hey...

Now I only have two coins. If I place one upon the other and allow the bottom one to fall will they seperate and if not why not ?
 
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1. ...How did NIST ever land on "The first APPEARED to be...." (re: WTC 7 steel (so FEMA stated but NIST now denies) sample in FEMA App C)? Explain this please.

If you look at the list of steel recovered from ground zero in the NIST report it appears they had trouble identifying which building the some of pieces belonged to. I'm not sure why, maybe they had no markings or if they did they were obscured by damage.
Maybe NIST first thought this steel came from building 7 and later decided to err on the side of caution when they couldn't tell conclusively.

2. ...Tell me your hypothesis on the apparent (so you imply) "no energy dissipation" through this WTC 7 column steel.

Are you really an engineer? Rephrase the question so it's understandable and I'll answer it.

3. ...How did those WTC 7 floor 13 framing beams both buckle and push the intersecting 79 to 44 girder (with or without shear studs, depending on which NIST report you read) off its seat @ column 79? How exactly?

I'm not sure, nobody is, NIST states this several times, experts that have far more credibility than you did the best they could with the information at hand to help improve building safety. Would you not agree buildings are now built more safely because of NIST?

4. ...Help me to understand why NIST is withholding the WTC 7 contract and ancillary construction docs from Ron Brookman S.E., and is denying his FOIA attempts to procure 3,370 files that include: 1. Remaining input and all results files of the ANSYS (FEA) 16-story Case B collapse initiation model. 2. Break element source code, 3. ANSYS scripts files for the break elements, 4. Custom executable ANSYS file, 5. All spreadsheets and other supporting calculations used to develop floor connection failure modes and capacities, and 6. Connection models....why withhold all this?

NIST has already given you the answer and it seems plausible to me, if you're not happy with it I believe someone has posted a remedy for you and Ron via the U.S. judicial system.
5. ...And what were the fractions of WTC 7 metal (example 96% Steel, 2% Aluminum, 1% Copper and so forth)? Doesn't have to be precise, ballpark will make my point very well, thank you.

I'd say the large majority of the "metal" was steel, though the building was also comprised of other material such as drywall, glass, etc.
 
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Okay. I have two steel balls.

They are attached by a steel rod.

I let go of the one in my right hand and then wait for it to pull the one from my left.

The one from my left hand leaves at more than g acceleration.

There were things attached to the wall on the inside. Some of them started falling at various times before the wall did and collided with one anotrher.

They would accelerate the wall.

Mystery solved?
 
Now I only have two coins. If I place one upon the other and allow the bottom one to fall will they seperate and if not why not ?

Like I said: Play a little while with your rulers and your coins. Try some variations of the expetriment setup. Observe carefully.
 
Derek,

I need to see where exactly "NIST specifically says that the external north wall fell, for approximately 100' at approximately g".

Where does NIST specifically say this Tom TFK at JREF? I'm looking at p. 602 of NCSTAR 1-9 right now...where, exactly?

You don't seem illiterate...

Do you understand what it means when someone puts something into quotation marks?
Do you understand what it means when they do not?

Please show me anywhere, in any of my posts, that I said that I was quoting NIST from page 602 in that "NIST specifically says ..." statement above.

That was my (accurate) phraseology of NIST's conclusions.

105' falls into my definition of "approximately 100'."

NIST says that their MODEL exhibits an acceleration of "g". NIST says that their MODEL is a linear, least square approximation of the real event.

Now, in reference to what NIST does say on page 602 of NCSTAR1-9, what part of "In Stage 2, the north face descended at gravitational acceleration" is impenetrable to you??

Did you not find the specific quotes on pages 598 & 599 that I referenced that prove that NIST was talking about the north wall & not about the whole building??

Are you unable to stretch your intellect to realize the inevitable conclusion that is contained within the sentence "The horizontal progression of buckling interior columns could not have been observed from the street..."? Meaning that "the collapse of the interior of the building was occurring, but not visible from the street."

You can't possibly this comprehension-challenged, can you?

You are supposed to be an engineer. You are supposed to be able to read technical publications FOR COMPREHENSION. Not like some vacuous teenager or internet blogger who can do no more than brainlessly cut & paste.

There are only two possibilities here, Derek.

1. (Your claim) NIST intends the "Stage 1, 2 & 3 timings to describe the descent of the entire building".

or

2. (My claim) NIST intends the "Stage 1, 2 & 3 timings to refer to the descent of the north exterior wall of the building".

Those are the only options.

If your contention is true, then WHAT THE HELL is NIST saying is collapsing for 13 full seconds before the north wall begins to fall??

Somebody here is lying and others who read this thread will not have to strain too much to figure it out.

Somebody is f'ken incompetent.

And, trust me, there is no strain involved in coming to that conclusion.

Please answer my questions. Please stop evading them.

If you are right, then what the hell does NIST say is collapsing for the 13 seconds before the wall begins to descend?

Please explain what you think that NIST suggests "broke" (on page 609, NCSTAR1-9) during:

"3. Initial Local Failure...
4. Vertical Progression of Failure ...
5. Horizontal Progression of Failure ..."


tom
 
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I guess it must be like I said because in any other situation column 79 did not support the Penthouse. It was just one of several columns and beams etc supporting the Penthouse. So there is no good reason for this 350 ton column to collapse from mere office fires is there ?

In general, structural elements have the dimensions they have because the need to have these dimensions. In the case of gravity-load-bearing columns, the columns that have to bear higher loads will tend to be bigger, stronger, heavier than those that bear lighter design loads.

If column 79 was the biggest and heaviest and strongest of them all, the economy of building will dictate that it better be the the one with the highest static loads, too.

Are you following?

Ideally, all columns are equally far removed from their respective point of failure. This means, that (ideally) no column is more or less likely than any other to fail.
From this you can conclude logically that column 79 was neither more nor less likely to fail than any other.
The mere fact that column 79 was stronger than the others does no change that fact.

However there is one difference: The strongest columns failing will bring its neighbors closer to their failure point than the weakest column failing would.
 
Two objects are both falling at g, yet one is moving faster than the other. Impossible!

A deep Newton-defying mystery to Truthers, "Duh, one started falling before the other one" to everyone else. Of course, Newton would know better than to read g as a velocity, so there might indeed be some kind of Newton-free zone somewhere around here.

Respectfully,
Myriad
... two 911 truthers who don't understand gravity, physics and 911. I can't believe this one!!!

Derek and bill, equal in understanding 911 in physics.

bill has no idea what g is, and Derek ignores it. I can't believe bill kept proving she does not understand g; Over and over! ... that is persistence.
 
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Ok, I will. But first Tom needs to clean up the steaming pile he left in the middle of the floor...

I see that you've decided to bolster your technical cred by getting into a mutual stroke session with Bill Smith???

:dl:

Why don't you provide us all with a description of an "object in free fall".

Tell me how many forces act on such an object in a vacuum?
How many forces act on an object in free fall in air?

Now, if there is a downward force on a falling object (like, for instance, that exterior wall) in addition to gravity, then what would be the object's resultant downward acceleration? Would it be equal to, less than or greater than "g"?

Are you so clueless that you cannot imagine any way in which a downward force could possibly be applied to a portion of a building during the building's collapse?

You know, like say something falling on on a part of it?

Just curious how much mechanical imagination you have ...

tom
 

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