Posted on 01/29/2016 9:38:48 AM PST by w1n1
“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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