The Truth is finaly told | Debunking 9/11 Myths: Why Conspiracy Theories Can't Stand Up to the Facts

Momentum and speed of free fall collapse concerns | Debunking 9/11 Myths: Why Conspiracy Theories Can't Stand Up to the Facts | The Editors of Popular Mechanics

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	• Debunking 9/11 Myths: Why Conspiracy Theories Can't Stand Up to the Facts The Editors of Popular Mechanics Hearst, 2006 - 192 pages average customer review:based on 133 reviews view larger image
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Putting a TV spin on this.....

Most of the conspriacy 9/11 books are like the same no substance reporting done by the networks every night.

This book is done more along the lines of PBS journalism shows like The News Hour and Frontline. It's that good.

The Truth is finaly told

Debunking 9/11 Myths: Why Conspiracy Theories Can't Stand Up to the Facts this is a great book it go into detail about 9/11
and uses science,facts and common sense to disproves all the misleading and Wrong conspiracy theories .The conspiracy theorie orented liberals (dems) will probably hate this book like the hate hate every thing else that tells the truth

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Momentum and speed of free fall collapse concerns

I've not read this book, but noticed some reviews questioning the pancaking theory based on the observation that the buildings collapsed at free fall speeds. The claim is that this should be impossible, since the momentum of each impacted floor would reduce the velocity of the collapse, slowing the collapse speed considerably.

These arguments are missing one major factor in their assumptions though. Momentum is the product of mass and velocity. The propagation of collapse would only be significantly slower than free-fall for the first few floors collapsed, since the weight and velocity of a few collapsed floors is not overwhelmingly greater than momentum of the next floor in the chain. However, when you get 10 or so floors slamming into the next, the momentum of the falling floors is much greater than the impacted floor, causing the impacted floor to be initially accelerated much faster than the gravitational acceleration rate, and only slightly decreasing the acceleration of the accumulated floors. As more floors are added to the stack, each additional impacted floor slows the collapse even less, until no appreciable deceleration is noted upon impact.

What is perhaps even more telling is that those who question the pancake theory argue that a controlled demolition was used to collapse the floors consecutively to give the appearance of the buildings pancaking. But even this demolition theory is subject to the momentum argument. According to those who argue that momentum would have slowed down the collapse rate, the bottom floor should have been traveling as fast as the stack when it was impacted, otherwise its momentum would have slowed the collapse. That means the bottom floor would have had to start falling at the same time as the top floor to get around the "momentum problem" claimed by some. Obviously, it can be seen that this is not the case, as all videos show the bottom of the structure intact until about the time that stack reaches it.

These "momentum theories" don't even hold up internally against their own notions of how the buildings collapsed. If you detect a problem (which turns out to not be a problem), but your own hypothesis is still subject to that problem, then you've got a problem.

And, no I'm not a Dr. or a structural engineer or a physicist, but I did take college physics, which is about all that's necessary to understand this argument.

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A Groundbreaking, meticulous, and scientific analysis of the 9/11 conspiracy theories

The first conspiracy theories about September 11 began to emerge while the wreckage was still smoldering. Today, nearly five years later, hundreds of books and thousands of Web pages are devoted to the idea that the U.S. government encouraged, permitted, or actually carried out the attacks. These theories claim to be based on hard evidence. But an in-depth investigation by POPULAR MECHANICS?first published in the magazine?s March 2005 issue, and now greatly expanded into book form?definitively proves that the evidence most often cited by conspiracy theorists is inaccurate, misinterpreted, or false.

The original article in POPULAR MECHANICS caused a huge groundswell of interest, setting off online debates that continue to this day. Debunking 9/11 Myths expands that investigation to include the 20 most prominent and persistent claims underlying the conspiracy theories, focusing on concrete, physical facts rather than political hypothesizing. Among the issues examined: claims that air traffic control violated standard operating procedures by not immediately intercepting the stricken jets; that the fire caused by the crashes wasn?t actually hot enough to melt steel and cause structural damage in the World Trade Center; that the holes in the Pentagon were too small to have been made by a Boeing 757; and that Flight 93 was actually shot down by an Air Force plane.

The fascinating and in-depth findings come from leading experts in all the relevant fields, including aviation, air defense, air traffic control, civil engineering, firefighting, metallurgy, and geology.
With a foreword by Senator John McCain.

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