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How long is it going to fall? 9/11
Blogger Nearly as fast as it would fall through air? Can an object fall through mass 5 times greater than itself nearly as fast as it would fall through air? (When only force available is gravity?) You need to be no expert in physics or structural engineering to answer this question. And you also need no expert to tell you what the answer is. All you need is a little bit of common sense. Undamaged part of the WTC1 under the impact zone was approximately 5/6 of whole tower. Photos of impact zone of WTC1 can be found here to check that there is only 1/6 of the tower mass above the impact zone. Use sky lobby as a reference point. See also this picture and this video. How long it really took for WTC to come down? See this video for approximate measurement of time it took for WTC2 to come down. See seismic record for more accurate times of leveling WTC1/WTC2 (it was really about 10s, virtually free fall speed). How this photo was done WTC 1 tower photo on the right is from amanzafar.com. It has been retouched to show whole height of the tower. I've created this graphic and I'm putting it here, with hope it will be possibly useful for other people and helps to open more eyes. If you want psd source, it's available here.
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