Reply To: Engineering Prof releases draft report on 9/11 collapse of WTC Bldg 7 in NYC


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#47200 Reply

Clark

I think the reason it’s gone quiet is that I can actually do simple physics.

You seem to have been convinced by Truther websites that you “understand free-fall”. Whether induced by explosives or not, hardly any material in a progressive collapse is in free-fall overall, because it is in constant random collisions with itself; that’s what makes the characteristic roaring sound. Sound is a form of energy, making that energy unavailable for acceleration of materials. The sites you seem to have frequented have been very selective in the aspects of the physics that they mention.

There are videos on YouTube comparing the descent of WTC7 side-by-side with multiple known controlled demolitions. Overall, scaled to occupy the same space on screen, the collapses indeed look very similar. But look more carefully – many storeys of WTC7 are the same height on screen as a few storeys of each other building, yet they fall side-by-side. This tells us that even known demolitions accelerate at less than the acceleration due to gravity.

Maybe the things you read on Truther websites are less than true.