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September 11, 2001

The attacks on September 11, 2001 left America stunned for quite some time. The world was in shock. No one could believe the complete and catastrophic destruction of World Trade Center’s 1, 2, and 7.

World Trade Center basic construction

World Trade Center’s 1 and 2 were constructed of massive steel columns and steel reinforced concrete. The weights below do not include elevators, plumbing, wiring, windows, utilities etc. While not an exact comparison, I’m certain you’ll see my point.

***** The weight of 1 cubic yard of concrete is 4,056 pounds.

***** The weight of 1 cubic foot of steel is 489 pounds.

Concrete: 225,000 cubic yards (4,056 lbs. x 225,000) = 912,676,266 pounds or 456,338 US tons

*****As a comparison, a football field contains 5,000 square yards. The concrete used in each tower would cover 45 football fields when poured 3 feet high.

Steel: 15,148 cubic yards (2,000 lbs. x 100,000) = 200,000,000 pounds or 100,000 US tons

What happened on September 11, 2001?

Many have their own thoughts, opinions and theory’s for what happened that day which I will not address but what I’d like to discuss is simple Physics.

Physics

The First Law of Motion states; that a body in motion at a constant velocity will remain in motion in a straight line unless acted upon by an outside force.

*****Example: A cyclist traveling at 30mph slams into a concrete and steel Jersey barrier.

The Second Law of Motion states that if an unbalanced force acts on a body, that body will experience acceleration or deceleration, that is, a change of speed.

*****Example: A cyclist traveling at 30mph slams into a concrete and steel Jersey barrier slows dramatically and abruptly.

The Third Law of Motion States for every action there’s an equal and opposite reaction.

*****This means that for every force there is a reaction force that is equal in size, but opposite in direction. That is to say that whenever an object pushes another object it gets pushed back in the opposite direction equally hard, overcoming its mass. • Example: A cyclist traveling at 30mph slams into a concrete and steel Jersey barrier. The barrier pushes back against the force applied.

911 Aircraft

Boeing 767

Construction: Skeletonized Aluminum

Weight: 395,000 pounds or 197 tons

Maximum Speed at 35,000 feet: 540mph

A Boeing 767’s weight is 0.041% than that of The World Trade Center 1.

When a hollow aluminum structure impacts a steel and concrete structure, there should be a collision at the point of impact. If you look closely at either plane, they appears as if they’ve melted into the building and this is absolutely impossible.

The physics of interaction simply wasn’t there, there was no collision. Simple physics will not permit a flimsy aluminum aircraft to melt through a steel and concrete building. Additionally, neither plane exhibited any deceleration at all! This again simply is not possible.

When either of these planes impacted the massive structures the nose of the aircraft would collapse and the wings deform, buckle, and snap and debris would fall to the ground yet none did and no debris was ever found.

If you’re interested, look up the B-25 bomber which struck the Empire State Building on July 28, 1945. The photos clearly show a proportionate amount of damage to both the aircraft and the building.

Speed

Because the flight of the second aircraft was recorded for several second prior to impact, its speed can be easily calculated using a distance over time equation. It took 2.97 seconds to fly a distance of 2,540 feet which equals 855 fps or 583 mph at sea level. The maximum speed of a 767 at 700 feet altitude is 400mph.

The Boeing 767 and most other like aircraft are designed to operate at maximum efficiency at 35,000 feet. At this altitude the maximum speed of a Boeing 767 is 540mph. At 35,000 feet the air is less dense or thinner by a factor of three than at sea level. For a Boeing 767 to fly 540mph at sea level it would require 6 times the power.