Posted on 01/29/2016 9:38:48 AM PST by w1n1
The following is a science experiment conducted by Vite NRK do not try this at home. - It's harder to create movement in water than in air, because water molecules are closer together than air molecules. To show the difference in resistance, physicist Andreas Wahl from Viten NRK puts himself in front of a weapon submerged in water and fires it - on himself.
Wahl's ballistic myth busting experiment and video evidence will have you second guessing all those underwater Hollywood action movie sequences. See it here.
“I wonder what the result would be if you shot down into the water from about 8 feet away. Would the bullet travel farther if it had a chance to develop some velocity in the air?”
Nope. Mythbusters did a great show on that. All bullets stopped within a few feet in water.
We had a guy destroy a boulder about the size of a small garage by drill a hole in it, filling it with water, capping it, and setting off a charge about the size of a shotgun shell. Crumbled the majority of it, but isn’t that more hydrostatic shock or is that what we are talking about here?
I think it’s what we’re talking about but will leave comment for people with better physics skills than mine. Mine are pretty much limited to filling a pop bottle with water and blowing the bottom out by slapping the top...
If the blast generated 100 lbs/sq. inch of over pressure at 10 ft, then at 20 ft (double the distance) = 100 / 3.14*4 = 7.96 lbs / sq inch.
That's why ship mines have 1000+ lbs of TNT, although we tend to forget even 5lbs of over pressure will generate 18,000 lbs of force on a 5'x5' hull plate, probably more than enough to rip the welds at some points.
Not if the welder is any good.
I figured that out when I was about twelve years old, shot a .45 ACP into a horse tank, you could watch it drop to the bottom.
I would take that bet! A 45 ACP FMJ 230 will only go through about a foot and a half of water, then drop to the bottom.
Makes sense. That's why muzzle velocity is the key stat for any given load and weapon.
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