Default Sidebar

[djtoast]

Thanks

Here's my take on this bit:

(although I'd LOVE to know which scientists work in feet and seconds not SI units .)

The correct way to work out how fast something falling from the height of the top of the towers to the ground (with no forces other than gravity acting on it) is

S=ut+ 1/2 a(t)EXP2

so S = 1350 feet or 411.5 metres
u, the initial velocity is 0
t is what we want,
a = 9.81

so 411.5=0+ 1/2 9.81.(tEXP2)

so 823 = 9.81.tEXP2

so t squared is about 83.9

so t is indeed 9.26


NOW

tell me where the hell this comes from:

The complete demolition of the North Tower at 10:29 am took 8.1 seconds.

Oh, suddenly we're all out of science. The prospects of correctly timing something falling TO EARTH when the ground is completely invisible due to an enormous cloud of dust seems to me to be problematic at best and more likely, impossible.