Could somebody give me evidence that friction causes molten metal?

[Shrinker]

My snooker ball analogy is plain right. When 2 free bodies like snooker balls collide energy is transferred.

No it isn't, the WTC didn't come from space. A better analogy would be a newton's cradle, where the earth is four balls and the WTC is the fifth. Imagine a tiny structure keeping the 'earth' and 'wtc' apart. What happens when you take the structure away? Both objects fall towards each other and reach a dead stop. The WTC does not push the earth.

A math problem: a 90kg astronouat in zero gravity has a 10 kg weight at the end of a spring. He is stranded 20m from his space shuttle with a velocity of 0. According to you if he throws the weight away from the shuttle the recoil will push him towars the shuttle. When the spring comes back the impact will push him towards the shuttle. How many throws before he is safely on board the shuttle?

Your last sentence is close though.

Likewise.

This is an excercise in pedantry however. You're intial introduction of these concepts was to prove that objects don't break when they hit the earth, which is just silly.

 

[gumboot]

I'd like to take this opportunity to wish pdoherty a happy birthday. It's a shame he can't be with us to share the occasion. We could have had cake.

Don't be stupid. You can't eat cake over the internet.

Not yet anyway... mwahahahahahahahaha

-Gumboot

 

[defaultdotxbe]

Not yet anyway... mwahahahahahahahaha

-Gumboot

will that be the brighter colored internet with more knobs?

/thread crossover

 

[delphi_ote]

Don't be stupid. You can't eat cake over the internet.

Not yet anyway... mwahahahahahahahaha

-Gumboot

Oh yea?

On this internet, you can have your cake and eat it too!

 

[William Rea]

This is an excercise in pedantry however. You're intial introduction of these concepts was to prove that objects don't break when they hit the earth, which is just silly.

It was? Well that's news to me? I thought we were talking about energy transfer processes which involved making enough heat to cause molten metal. I'm darned interested to have it pointed out to me where I proposed that objects hitting the Earth don't break!

Yeah, lots of people that understand the mechanics of energy conversions are just plain pedantic.

 

[Shrinker]

It was? Well that's news to me? I thought we were talking about energy transfer processes which involved making enough heat to cause molten metal. I'm darned interested to have it pointed out to me where I proposed that objects hitting the Earth don't break!

Yeah, lots of people that understand the mechanics of energy conversions are just plain pedantic.

Apologies if I read the thread too quickly, but it seemed to me when reading this post and the posts to which you are responding, that you are trying to downplay the KE of the towers in the final collision with the earth. I asked if you meant that falling objects don't break and you didn't respond. I asked if you could quantify the amount of KE lost to the earth's KE sink and you also didn't respond. I got the impression you wich to imply the KE of the towers played little or not part in the pulverisation, melting, bending etc.

http://www.internationalskeptics.com/forums/showpost.php?p=2017165&postcount=132

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.

 

[Crazy Chainsaw]

I just proved myself wrong, the friction could have created tons of molten steel not with friction against the steel, but by stripping the Aluminum Oxide off the Aluminum and causing it to burn at 2800c in oxygen, Why did I not think of sand blasting Molten Aluminum with drywall and concrete dust before. That is the action that would have occurred in the twin towers, I have to be the stupidest moron on earth not to think of that reaction!
All it took was filling a cheap sand blaster with pulverized Drywall and concrete, and spraying it into molten aluminum.
Wonder what would have happened if some of that material had it building 7 on the lower floors?
It is well documented that friction causes thermite like aluminum Oxidation reactions.