by careinke » Fri 10 Jan 2020, 21:10:23
$this->bbcode_second_pass_quote('Outcast_Searcher', '')$this->bbcode_second_pass_quote('careinke', 'I') saw a report on Fox that said the video showed the hit, and then the bang sound came 10 seconds later, proving the airplane was only two miles away. Frankly, that just doesn't line up with physics. Last time I checked the speed of sound is right around 600 mph (depending on atmospheric density), which means if it was a ten second "flash to bang", the plane would have been 10 miles away, not 2.
Basic NBC training; Flash, drop and start counting, Boom, whatever number you are at is how many miles you are from it, move perpendicular to the wind to avoid fallout. It is also useful to tell how far away lightning is from you...
So you can't do fifth grade math and check before claiming that?
I remember as a child knowing that a rough guess for lightning distance re time to the thunderclap, was 5 seconds per mile. So I checked (given how uneven my memory is at age 60).
There are 3600 seconds per hour.
Looking it up to verify, instead of guessing, speed of sound roughly 750 mph. (It varies based on conditions, but this is a decent figure for back-of-the-envelope sanity checking). 700 is a far better round figure to use for many conditions than 600, BTW.
For example:
https://www.engineersedge.com/physics/s ... _13241.htm 750 mph / 3600 seconds per hour = .20833 miles per second, or call it .21 rounded.
So, certainly close enough to a mile per 5 seconds to call that a good rule of thumb.
...
Seriously. THIS IS THE INTERNET. Is basic fact / sanity checking SO HARD, before blaring how wrong figures you have doubts about are, before showing you're completely clueless yourself?
Again, credit to asg, for pointing out how much "The Death of Expertise" should be reading and applying the principles used, by the vast majority of would-be experts in "all things" on the web.
https://www.amazon.com/Death-Expertise- ... B01MYCDVHH Yes you are right my math was wrong. (I am getting old). Somehow I confused calculating aircraft speed for intercepts, to Mach, where airspeed is in knots and Mach 1, is around 600 knots at altitude.
The drop and count was still used for Nukes, but I must have forgot the multiplyer.
Thanks for the correction and Mea Culpa.