First of all…
That whole “where’s the plane?” argument: where are the planes from the WTC towers? We saw them crash into the buildings, where did they go?
We naturally have this intuitive feeling that since a plane is a big solid object, it should be left behind after a collision (if not in a zillion pieces.) But an airliner is leightweight, mostly hollow, filled with fuel and travels at a high speed. If it hits something, you won’t see much left.
Next…
In order for the wings to FOLD UP they would have to hit the building first…
Why would that be true? Of course they don’t have to hit the building first to fold up. The wings aren’t that strong, and they will shear, fold, rip, etc. in that kind of scenario.
The kinetic energy released by an 80 aircraft traveling at 560 mph is in the neighborhood of 25,088,000,000 psi. 25 BILLION pounds per square inch is a whole lot of force [EK=1/2(mass)x(velocity squared).
You just computed (1/2)(80 tons)(560mph)^2 to get that number. That’s not pressure, that’s kinetic energy, expressed in pound-miles^2/hr^2.
Right away you should know that the math is wrong because pressure is in units of pounds/inch^2. It doesn’t even match units, and the units are off anyway, miles over inches.
Finally…
As for the whole “that force should put a bullet through titanium” argument, whether you create a hole is a matter of how localized the force is, and how well the projectile holds up rather than shredding itself. If the energy obliterates the plane, that’s energy that isn’t making a hole.
If you don’t believe me, try dropping (a) a water balloon, and (b) a steel ball of equal mass off a tall building. They have the same kinetic energy, and by the above argument a water-balloon should be able to punch a hole in a roof.
Caj