Could somebody give me evidence that friction causes molten metal?

[alexi_drago]

If only they'd had desks in the WTC

 

[The_Fire]

when did i claim an excavator ran into the steel, straw man

So now there were no excavators at ground zero? Take another look at that post in it PROPER context before you yell strawman......

 

[Shrinker]

The (Gravitational) Potential Energy does work on the mass making it fall. The energy conversion is PE to KE and if there are no losses then at all times during the fall KEt = PEo - PEt. The object gains KE by losing its PE.

As the object hits the ground KEt = PEo, KEt does work on the Earth and because it is such a massive object the Earth acts as a Kinetic Energy sink. Literally the earth moves!

Note that PEo is a potential difference in energy level from a reference and gravitational forces act between the centres of objects.

In the case of the collapse...

KEt = PEo - PEt - Collapse Losses

The Collapse Losses would be work done through mechanical deformation of the structure during collapse.

So things don't break when you drop them? Can you quantify how much of PEo was transferred to the Earth, and how much was used for additional breakages?

See, when I view the collapse videos, I see a lot of dust emerge during the collapse, then when the thing hits the deck, I see a cloud significantly denser, more energetic and ultimately larger. That implies to me that the ground collision did more pulverising than the collapse.

I've never seen anyone else claim this though, so both sides fire away!

 

[The_Fire]

Could have been it, thats still a far cry from nothing but tiny particles.

5-7 cm would be 2-3 inches.

And that was from the first weeks of the cleanup, were they were still in the outskirts of the Pile where the most damaged/"pulverised" debris from the topfloors would have landed.

[goes out on a limb]
Is it, without evidence to back it, theoretical possible for larger pieces of furniture from the lower levels to have existed in the innards of the pile, smoldering to ashes before the cleanup crew reached them?
[/goes back on safer ground]

 

[defaultdotxbe]

If only they'd had desks in the WTC
http://www.acte-gratuit.net/img/duckncover01.jpg
http://www.ljplus.ru/img/h/s/hsgpc/duckandcover.png

...or turtle shells

 

[Hellbound]

...or turtle shells

Or boxes made out of chicken wire and wood. Those don't collapse.

 

[pdoherty76]

I believe there's a quote in the Naudet documentary saying that the largest piece of a telefon the fireman found was half a keypad (he showed something in the area of 5-7 centimetres with his fingers, not sure of the inches).

would you like to put that quote in context? the fire man was making the poin that he was so amazed that that was the biggest piece he found

 

[defaultdotxbe]

Or boxes made out of chicken wire and wood. Those don't collapse.

wait a second, does this mean we are conceding a-bombs at the WTC? lol

 

[Hellbound]

wait a second, does this mean we are conceding a-bombs at the WTC? lol

No way, dude.

Photon torpedoes in the exhaust vents.

 

[defaultdotxbe]

No way, dude.

Photon torpedoes in the exhaust vents.

one thing that always bothered me about that was that it was excelsior that was cataloging the gaseous anomolies, not enterprise

...i think i just reveled how big a nerd i really am...

 

[Hellbound]

one thing that always bothered me about that was that it was excelsior that was cataloging the gaseous anomolies, not enterprise

...i think i just reveled how big a nerd i really am...

Heh.

Not really, I was thinking of Star Wars and the Death Star.

I have no idea what you're talking about

 

[RenaissanceBiker]

ANYWAY, the seized crankshaft is a perfect example of friction causing metal to melt. It's pretty impressive to take a seized engine apart and see the shaft neatly welded to the case.

 

[Hellbound]

BAck on topic:

Machine guns. Look for pictures of an M-60, or an M-2, or a similar weapon that was fired too long without changing the barrel.

The .50 cal M-2 has to have the barrels changed with oven mitts, because you'll get third degree burns from it grabbing with your hands. All friction. THe barrel can be melted within a few minutes of firing.

 

[rwguinn]

<IMG class=inlineimg title="Jaw Dropping" alt="" src="images/smilies/mazeguyemotions/jaw-dropping.gif" border=0 smilieid="318">
You do not have any knowlege of physics.

fixed it

Edited to add: WTH? That was scrambled!

 

[The_Fire]

would you like to put that quote in context? the fire man was making the poin that he was so amazed that that was the biggest piece he found

And that changes the context of my post how again? Or didn't you notice the post I was answering to which were about the size of the debris and not the amazement of the people finding it.

 

[The_Fire]

fixed it

Edited to add: WTH? That was scrambled!

It showed in html codes on my screen instead of bb code.......

 

[alexi_drago]

one thing that always bothered me about that was that it was excelsior that was cataloging the gaseous anomolies, not enterprise

...i think i just reveled how big a nerd i really am...

I disagree.
Somebody hacked the buildings main computer and transfered all power from the structural integrity field causing a core breach.

 

[The_Fire]

I disagree.
Somebody hacked the buildings main computer and transfered all power from the structural integrity field causing a core breach.

And then promptly replaced the entirety of New York with a holodeck running a perfect copy of it to cover up the massive hole in the ground which were all that was left af THAT little antimatter disaster.......

 

[I less than three logic]

Heh.

Not really, I was thinking of Star Wars and the Death Star.

I have no idea what you're talking about

William Shatner: It all began with with the Star Trek Wars.

Zapp Brannigan: You mean the great migration of Star Wars fans.

William Shatner: No, that was the Star Wars trek.

 

[alexi_drago]

And tractor beams pul..... OMG It's all making sense now.