Post
Topic
Board Politics & Society
Re: University Study Finds Fire Did Not Cause Building 7's Collapse on 9/11
by
Spendulus
on 18/05/2020, 22:21:41 UTC
....


It doesn't matter which direction it collapses. Collapsing inwards doesn't magically remove the resistance of the internal infrastructure. Fire doesn't do that. Impact damage doesn't do that. I don't need precise measurements of every detail and qualifier you want to tack on for you to obfuscate that your theory requires the laws of physics to be violated. Gravitational acceleration, or "free fall" speed is approximately 32 ft/s2. Anything close to, at, or above that downward velocity REQUIRES zero resistance form internal infrastructure to be achievable under Newtons third law of motion. It is required, because if there was resistance, some of the energy held in the velocity of the downward acceleration would be lost in the destruction of the internal infrastructure as it fell, resulting in the slowing of its fall. ...

Actual written down math equations will always beat your blabber. You don't appear to even understand the matter, though. Here you go.

"Free fall" speed is not 32 ft/s2. That's the acceleration.

The speed may be considered as 32 ft/sec for the first second, 64 ft/sec for the 2nd section, and so forth. We're using 8th grade here, so no calculus. But it still works fine.
v (ft/sec) = 32(ft/sec2) * t(sec)

As the speed doubles, the kinetic energy quadruples.
e = 1/2*m*t^2

That "friction" that you keep harping about does not have to be zero. It could be a small amount, or a moderate amount. It's only in your head that it has to be zero. I repeat your assertion. "It is required, because if there was resistance, some of the energy held in the velocity of the downward acceleration would be lost in the destruction of the internal infrastructure as it fell, resulting in the slowing of its fall. ..."

Obviously, this "slowing of v" is trivial. It might have a significant effect on the 1st second. Say that is 1 second longer. It will then have 1/4 that effect on the 2nd second, 1/9 on the 3rd and so forth.

The series described is 1/2, 1/4, 1/9, 1/16, 1/25. That is the Basel problem, first solved in 1734. I confess to thinking it would be beyond 8th graders capabilities, and started to just suggest something less that 1.7 seconds.

But then I found this dude.

Ikhwan Mirza Hafiz
i'm 13 and i like maths and science
. Assuming eight graders are 13, I guess I can continue.

The answer is pi squared / 6, or 1.644934066848.

Explaining what this means. Even with serious "friction", you will never have more than 1.64 seconds added to the descent time.