Quiz for "A Critique of the NIST WTC Reports and the Progressive Collapse Theory"

Take this short quiz to test your understanding of the material and verify that you completed the presentation.

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1. Your Information:

Name:

Email Address:

City, State:

Engineer, Architect, or Other?

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2. The Twin Towers' structural system included:

a. 14” x 14” square steel tube perimeter columns at 3' 4" on-center on all four sides of the building.

b. 47 massive core columns.

c. Lightweight steel trusses supporting concrete floor decking.

d. A hat-style, top-level truss, which tied the perimeter columns to the core columns.

e. All of the above.

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3. Which of the following statements are true about the similarities and differences between the destruction of WTC 7 and the Twin Towers?

a. The destruction of WTC 7 and of the Twin Towers occurred at or near free-fall acceleration.

b. The steel frames of WTC 7 and of the Twin Towers were almost entirely dismembered.

c. The destruction of WTC 7 was more of an implosion, with its debris contained mostly inside its own footprint, whereas the destruction of the Twin Towers was more explosive, and their structural members were ejected as many as 500 feet away from each tower’s base.

d. The visible destruction of WTC 7 started near its base, while the destruction of the Twin Towers did not start at the base of each tower.

e. All of the above.

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4. The National Institute of Standards and Technology (NIST) was tasked by Congress with determining how and why the Twin Towers collapsed. The most important aspect of the resulting NIST report was its "probable collapse sequence," which outlined the steps that NIST claims led to collapse. Which of the following is true about that report?

a. It stopped at the point of "collapse initiation," before the actual collapse began. NIST would later admit that is was unable to provide a full explanation of the total collapse of both towers.

b. It included detailed analysis of the complete collapse, accounting for the ability of the intact steel frame beneath to resist the falling mass above.

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5. True or False: The top sections of the Twin Towers fell almost as quickly as would a bowling ball dropped off the side of the building.

True. The upper sections fell at 2/3 of free-fall acceleration and never once observably slowed down.

False. They slowed down as they fell — as would be expected of a falling block that is crushing the structure below it.

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6. The 110 stories of concrete flooring weighing 90,000 tons in each of the Twin Towers:

a. Were found stacked up at the bottom after the collapse.

b. Were pulverized to a fine powder, creating a four-inch deep blanket of dust across lower Manhattan.

(This concludes the quiz. The following questions are optional.)

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7. Optional: Do you believe that a new investigation into the collapse of the World Trade Center Twin Towers is warranted?

Yes

Other (please specify)

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8. Optional: Would you like to receive our occasional email news bulletins?

Yes!

No, thank you.

100% of survey complete.