More than a decade after the terrorist attacks that shook the nation, questions still surround what happened during 9/11.
From the collapse of the twin towers, to whether the White House had inside knowledge, AllTime 10s brings you, the 10 most shocking conspiracies about 9/11.
OR . . . Static Versus Dynamic Loading
By Dave Burton via Burton Systems Software – (burtonsys.com)
Some conspiracy theorists are puzzled about why the WTC towers fell at almost free-fall speed on Sept. 11, 2001. They suppose that the speed of collapse is evidence that something or someone must have destroyed the structural integrity of the undamaged lower part of each tower.
After all, they reason, “only the upper floors of the building were damaged, so why did the lower floors collapse, and why did they fall so fast?”
This web page answers those questions, simply enough for even a conspiracy theorist to comprehend (I hope). I do use some simple math and some very basic physics, but even if you don’t understand that part you should still be able to comprehend the basic reasons that the towers fell so fast.
What the conspiracy theorists apparently don’t understand is the difference between static and dynamic loading. (“Static” means “while at rest,” “dynamic” means “while moving.”)
If you don’t think it can make a difference, consider the effect of a stationary bullet resting on your chest, compared to the effect of a moving bullet striking your chest. The stationary bullet exerts a static load on your chest. A moving bullet exerts a dynamic load.
As a more pertinent example, consider a 110 story building with a roof 1,368 feet high (like the WTC Twin Towers). Each floor is 1368/110 = 12.44 feet high, or aproximately 3.8 meters.
Now, suppose that the structural steel on the 80th floor collapses. (Note: I’m using as an example 2 WTC, which was the building that collapsed first.)
The collapse of the 80th floor drops all the floors above (which, together, are equivalent to a 30 story building!) onto the 79th floor, from a height of aproximately 12 feet.
Of course, the structure of the lower 79 floors has been holding up the weight of the top 31 floors for many years. (That’s the static load.) So should you expect it to be able to hold that same weight, dropped on it from a height of 12 feet (the dynamic load)?
The answer is, absolutely not!
Download HD version of this video for reposting: http://tinyurl.com/7rjrsjr
- “You Know You Are a Conspiracy Theorist If…” (illuminutti.com)
A serious video: The “unexplainable” collapse of 7 World Trade Center is the most compelling case put forth by 9/11 Truthers. But there is more than enough evidence that WTC7 collapsed due to fire — no secret demolition ninjas necessary.
The text below is for people interested in actual inquiry, and are legitimately examining both sides’ arguments for inconsistencies, intellectual dishonesty, and logical flaws.
1. Things conspiracy believers do not want you to know:
- WTC7 underwent a slow, internal progressive collapse, plainly observable in the full-length CBS video, which is rarely shown on conspiracy sites.
- WTC7 actually did NOT collapse straight down or “into its own footprint.” 30 West Broadway, across the 4-lane Barclay St., was heavily damaged. See photo: http://www.debunking911.com/wtc7pile.jpg
- The 1,500 “experts” at ae911truth.org are mostly electrical and chemical engineers, residential architects, students, etc. with little or no experience in steel skyscraper construction.
- The NIST study was done in cooperation with the SEI/ASCE, SFPE, AISC, and SEAoNY — actual engineering experts in the field, all of whom would have to be in on this conspiracy, even to this day.
- The “explosive traces” or “thermite” claim comes from non-chemist Steven E. Jones, who analyzed samples sent to him privately with no chain of custody. His paper appeared in a journal that charges $800 to publish; Google “CRAP Paper Accepted by Journal” to read about its “peer review” process. Jones, a devout Mormon, also published “evidence” that Jesus visited American Indians; Google “Behold My Hands.”
- No “molten metal” was ever collected from WTC7 and analyzed.
- Rigging a large building for demolition cannot be done “over the weekend,” nor would such preparation escape the notice of office workers. Demolition professionals laugh at this claim.
- Thermite cannot be used to demolish a building.
- There exist NO peer-reviewed papers supporting controlled demolition, anywhere.
MORE . . .
True or False: Only explosives could have caused the buildings to collapse on 9/11.
Download HD version for reposting: http://tinyurl.com/7rjrsjr
- 9/11 Truthers are Dummies (DailyKos) (thepeoplesvoice.org)
- The CIA Admits 9/11 was a Metaphysical Catechism (thepeoplesvoice.org)
- Nearly Half of Americans Don’t Know About the Collapse of WTC 7 on 9/11 (jeremyrhammond.com)