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Politics : Foreign Affairs Discussion Group
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To: Bilow who wrote (203002)9/15/2006 2:15:06 AM
From: Doug R  Read Replies (1) of 281500
 
Another problem with your "amazing" analysis is that essentially ALL the concrete fell from an average height.
It doesn't matter HOW MUCH concrete falls from that height.

10 lbs of concrete at that height carries an amount of potential energy. Drop it and that energy is not enough to turn it into 60 micron particles.

Try it with 100 pounds...same result. You have 10 times the potential energy but also 10 times the concrete to turn into 10 times the dust.

NO amount of concrete will pulverize to 60 micron particles dropped from that height.

All you did was reduce the amount of concrete but that did nothing to change the ratio of energy available for a mass of concrete at a known height vs the energy required to pulverize it when dropped.

But you'll also notice that very much of the concrete turned to this dust within a second of the collapse wave reaching intact building.....all the way down. That concrete didn't even fall 1/10 the avg height. Where did the energy come from to do that?

If you use up all the building's potential energy to pulverize the concrete, WHERE is the energy necessary to collapse the building? It's not there.

And then there's the post-collapse pyroclastic flows needing over 12 times the energy available in the building before collapse.
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