Re: British Institute of Nanotechnology: Military Involved in 9/11
Wrong. There is no fudamental differences between large masses falling and small ones.
When in a vacuum, a feather will fall at the same speed as a large piece of steel.
In the earthly world, two objects with similar density, and similar shape(same aerodynamics) will fall with the same speed, and will reach the same terminal speed, regardless of their sizes.
Assuming equal density, while a larger falling object carries a larger amount of kinetic energy than small one, the energy is distribute evenly to the whole mass, so kinetic energy contained in per unit mass in the larger object is the same as the small one. So on impact, damages to the objects are proportional to their respective mass.
For example, assuming 1 horse = 1000 cats weight. When these two objects land on the ground, 1 cubic inch of cat flesh is destroyed, and 1000 cubic horse flesh got destroyed. At the surface, it looks like horse sustained 1000 times of damage than a cat, but in relation to their mass, in fact each sustained damage to 1% of their respective body mass.
So you say:"But a freshly killed cat doesn't splash, it bounces. A horse, no matter how agile, WILL splash"
And I say, that is wrong. They would both produce a sound of "thump", and lower half of cat and lower half of horse got destroyed.
I must admitted my statement is wrong here(was at work, could not think carefully before posting). I ignored the cases like: bomb explosion, high speed water cutter, sea water smoothing rocks, etc.
Yes, lesser density objects do damage higher density objects. However, the damage is mutual to both objects. In an explosion, the destruction of a small piece of steel would necessary matched with a destruction of a huge mass of air.
If you collide the cat with the horse, than one cubic inch of damaged cat flesh will match with one cubic inch of damaged horse flesh. So a smaller object colliding with a larger object with similar density, with enough force, the smaller object will get totally destroyed, yet the larger object will still have the mass of (original mass - smaller object mass).
This is the essence of Third Newton Law. In a collision, you cannot focus on the damage done to the collided object, you will have to consider the damage done to the colliding object as well.
OK, then I ask you again:
Now, I put a 800,000 ton air filled glass ball of size 2 meter diameter in its path.
What happen then?
You still fail to understand the Third Newton Law, and my original argument.
When considering the collapse, you focus solely on the effects of collision on the lower 94 floors, yet fail to discuss the effects of collision on the upper 16 floors. If the upper floor section can destroy one floor of the lower section, then you have to see that the lower section would at the same time destroy one floor of the upper section. If this process continues, then the upper floor section will exhaust its mass before the completed destruction of the lower floor section. The collapse will stop right at 94-16 = 78 floors.
In addition, in your analysis of collapse sequence, you isolate the lower 94 floors into one single floor at a time, but consider the upper 16 floors as one integrate unit. This is selective bias. You either consider both upper and lower floor sections as individual floors or a one single unit for each. You cannot slice one object into pieces yet keep another object as a whole body.
This is the fatal flaw the Dr. Greening, Dr. Bazant, and NIST rely on in their analysis.
P.S. Please do not use "dead cat bounce" to help with your analysis. It is a financial term, not a physics phenomenon.
Originally Posted by skyson
You are suggesting that the bigger the object, the easier to be destroyed, given similar density of the objects.
You are suggesting that the bigger the object, the easier to be destroyed, given similar density of the objects.
Originally Posted by c1ue
No, I'm suggesting that you cannot understand the fundamental differences between large masses falling and small ones.
You continue to reinforce this behavior.
No, I'm suggesting that you cannot understand the fundamental differences between large masses falling and small ones.
You continue to reinforce this behavior.
When in a vacuum, a feather will fall at the same speed as a large piece of steel.
In the earthly world, two objects with similar density, and similar shape(same aerodynamics) will fall with the same speed, and will reach the same terminal speed, regardless of their sizes.
Assuming equal density, while a larger falling object carries a larger amount of kinetic energy than small one, the energy is distribute evenly to the whole mass, so kinetic energy contained in per unit mass in the larger object is the same as the small one. So on impact, damages to the objects are proportional to their respective mass.
For example, assuming 1 horse = 1000 cats weight. When these two objects land on the ground, 1 cubic inch of cat flesh is destroyed, and 1000 cubic horse flesh got destroyed. At the surface, it looks like horse sustained 1000 times of damage than a cat, but in relation to their mass, in fact each sustained damage to 1% of their respective body mass.
So you say:"But a freshly killed cat doesn't splash, it bounces. A horse, no matter how agile, WILL splash"
And I say, that is wrong. They would both produce a sound of "thump", and lower half of cat and lower half of horse got destroyed.
Originally Posted by skyson
Another absurd example. Did the air collide with the bridge? The density of air is vastly smaller than the concrete of the bridge. An object with lesser density could destroy an object with higher density?
Another absurd example. Did the air collide with the bridge? The density of air is vastly smaller than the concrete of the bridge. An object with lesser density could destroy an object with higher density?
Originally Posted by c1ue
Oh? So now you're saying the wind did not collide with the bridge?
What you still fail to understand is that ANY energy transfer is a collision - whether it is miniscule or gigantic.
And yes, the density of air is FAR less than that of the bridge. So you have your example of a less dense object destroying a greater one.
You did not stipulate the means.
Oh? So now you're saying the wind did not collide with the bridge?
What you still fail to understand is that ANY energy transfer is a collision - whether it is miniscule or gigantic.
And yes, the density of air is FAR less than that of the bridge. So you have your example of a less dense object destroying a greater one.
You did not stipulate the means.
Yes, lesser density objects do damage higher density objects. However, the damage is mutual to both objects. In an explosion, the destruction of a small piece of steel would necessary matched with a destruction of a huge mass of air.
If you collide the cat with the horse, than one cubic inch of damaged cat flesh will match with one cubic inch of damaged horse flesh. So a smaller object colliding with a larger object with similar density, with enough force, the smaller object will get totally destroyed, yet the larger object will still have the mass of (original mass - smaller object mass).
This is the essence of Third Newton Law. In a collision, you cannot focus on the damage done to the collided object, you will have to consider the damage done to the colliding object as well.
Originally Posted by skyson
"A 100,000 ton air filled glass ball of size 1 meter diameter will crush anything in its path. "
WOW, what kind of material this is, PROFESSOR?
"A 100,000 ton air filled glass ball of size 1 meter diameter will crush anything in its path. "
WOW, what kind of material this is, PROFESSOR?
Originally Posted by c1ue
The same kind of material as stipulated by your original example.
That is - an absurd amalgamation of materials intended to convey a point.
The same kind of material as stipulated by your original example.
That is - an absurd amalgamation of materials intended to convey a point.
Now, I put a 800,000 ton air filled glass ball of size 2 meter diameter in its path.
What happen then?
Originally Posted by skyson
Again, you are ignoring my original argument. It is not about how heavy the upper floor section is, it is about its mass in relation to the mass of the lower floor section(In WTC1, it is 16 floors vs. 94 floors).
Again, you are ignoring my original argument. It is not about how heavy the upper floor section is, it is about its mass in relation to the mass of the lower floor section(In WTC1, it is 16 floors vs. 94 floors).
Originally Posted by c1ue
Your original argument is exactly as I stated. You stated that there is no way a 16 floor falling building can destroy a 94 floor standing building.
Relative masses are irrelevant. Each floor of the 94 floor building is intended to support a specific standing weight - not an impact. We're not talking about billiard balls where both the strength of the material is so large and the material dense such that energy impacts are evenly distributed through the entire structure.
Secondly you also assume that the collapse was only at the impact point. It could have been at either a lower or higher floor; the jet fuel would possibly have gone down while the fire would possibly have gone up.
Your original argument is exactly as I stated. You stated that there is no way a 16 floor falling building can destroy a 94 floor standing building.
Relative masses are irrelevant. Each floor of the 94 floor building is intended to support a specific standing weight - not an impact. We're not talking about billiard balls where both the strength of the material is so large and the material dense such that energy impacts are evenly distributed through the entire structure.
Secondly you also assume that the collapse was only at the impact point. It could have been at either a lower or higher floor; the jet fuel would possibly have gone down while the fire would possibly have gone up.
When considering the collapse, you focus solely on the effects of collision on the lower 94 floors, yet fail to discuss the effects of collision on the upper 16 floors. If the upper floor section can destroy one floor of the lower section, then you have to see that the lower section would at the same time destroy one floor of the upper section. If this process continues, then the upper floor section will exhaust its mass before the completed destruction of the lower floor section. The collapse will stop right at 94-16 = 78 floors.
In addition, in your analysis of collapse sequence, you isolate the lower 94 floors into one single floor at a time, but consider the upper 16 floors as one integrate unit. This is selective bias. You either consider both upper and lower floor sections as individual floors or a one single unit for each. You cannot slice one object into pieces yet keep another object as a whole body.
This is the fatal flaw the Dr. Greening, Dr. Bazant, and NIST rely on in their analysis.
P.S. Please do not use "dead cat bounce" to help with your analysis. It is a financial term, not a physics phenomenon.
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