Physics Principles Known for Centuries
1. E and p=mv
are conserved
o If buildings collapse from fires -> only gravitational E available
o Most could fall in 1.5 secs from g = 0.5gt2 = 36 ft (g=16
ft/s2 on Earth)
o S Tower observed to fall ~ 140 ft in < 1.5 s!
F ~ 4-5X as large observed. Not g!
o Calculations have repeatedly shown > 10X amount of E used in falls
o g cannot produce sizeable horizontal E used. What is the source?
o How conservation of p is satisfied for S Tower squibs?
-- Total p in horizontal motion must balance.
-- Squibs observed require countersquibs or at least counter F
o Only explosion is consistent with observations
o If explosion, tremendous F from followup implosion from gradient of
P
2. Have no Energy available in gravitational freefall
o Must have Resistance to fall from freefall speed to do Work.
o Amount of work is E required to overcome that Resistance.
