How big of a shaped charge would a person need to blow a hole through a typical bank vault?
475852
About as big as this one from LLNL?
1024881
during world war 2, we did actually invent this. it would plow it's nose into the ground that was about 2 inches thick if i remember correctly. Just the crater it left was phenomenal. then, when it exploded underground, it made another crater about the size of the impact crater. the biggest version of this was as tall as a two story house! sadly, the atomic bomb overshadowed this marvelous invention.
316156
It all depends on the size of the hole you are sticking it in.
913051
By my calculations and assuming that the farts have an average volume of 27 cu.in. and an average density of 1.0235 that of air (it's the .0235 that kills), I would approximate that the number would be in the range of 1435 - 2013 rippers. Now, of course, this is assuming that the gaseous subject stands at least a foot from the filter intake so that no "blowouts" occur. Other factors that I have not considered are: 1) the number of onions consumed 2) no introduction of corned beef and cabbage 3) no naked hineys (must be wearing 501 jeans) 4) no air sprays allowed to mask the overwhelming stench.\nGood luck on proving my theory.
329259
depends on the type and country. thrown explosives or incendiary devices
417101
averagely it would be 1 cm ^3 (1 cm cube) because its as big as one of those 1 cm blocks. or it cloud be 1ml, seeing as they're the same.\nthis is an estimate.
51190
They would get a nasty bump on the head.  The terminal velocity of a falling penny (maximum rate at which it will fall through the atmosphere) is insufficient to cause serious damage to a normal human skull.
436333
First find something fibrous like a carpet, a fuzzy carseat, or something else like that.  Rub your clothing on it for a good bit.  Make sure you aren't standing on or around something metal or it'll ground you instantly (thus negating any charge you'd build up).\n\nAdditionally, a factor that you have little control over--you must be in an area that has relatively low ambient humidity (<<10%).  If you live in a Rainforest, for example, pretty much nothing you do will generate enough static to create a shock.  Good luck and happy shocking.
1160030
Not if the big bang was a "shaped" charge (i.e. resulted from the collision of two or more irregular surfacesor dimentions)
802234
There's this nuclear hand grenade, see?  It can create a crater 100 yds by 80 yds, see?  Only problem is that the average soldier can only throw a grenade 40 yds.\n\nBut, see: http://en.wikipedia.org/wiki/W79  Anything smaller is rather pointless, since the amount of fallout and other effects makes using a conventional weapon more appropriate.
813427
The size of the metal would be dependant on many factors such as plane design and location of the explosion to name a few.\n\nthe problem with elemental rare earth metals is they are very reactive with water, making handling them in such a manner virtually impossible.\n\nAs far as the realative reactivity, the ammount of energy released can be calculated from the Gibbs free energy for each reaction.\n\nFor the reaction of sodium with water at room tempreture\n\nSodium with enough water would release 9260 KJ per pound of sodium while Potassium would release 2350 KJ per pound.\n\nI would suspect that at least 10 pounds of sodium to do any significant damage to a plane and 50 pounds of potassium.\n\nThis is a very unreasonable amount, although the cost would be less than 1000 dollars for this ammount of sodium, there are very few places that a large quantity could be obtained.\n\nAdditionally, sodium is so reactive, that I do not think that anyone could ever get it onto a plane before it blew. Lastly, that large of an ammount of sodium would fill a carry on bag, and would never get thru even the worst of TSA screeners.
353215
I work in a hardware store, just as an introduction.  So I am cheating because I know the "rule of thumb" that has all the other factors in it like density and stuff.  Quickcrete (TM) says that an 80lb. bag of premixed concrete will do 2/3 of a cubic foot.  There are 27 cubic feet per cubic yard, so it takes about 40 80lb. bags per cubic yard (at a hardware store they just say "yard" and mean cubic yard).  One bag does one two foot deep fence post, not that anyone asked.
469436
READ PATEINTLY.. IT MAY APPEAR LONG BUT I GURANTEE YOU SATISFACTION....\n\nyes it is safe....\n\n\nBUT NOT BECAUSE OF RUBBER TYRES..... REMEMBER...\n    \n    NOT BECAUSE OF RUBBER TYRES...\n\nActually when lightening strikes earth surface the charge is in search of the shortest path (least resistance path) to reach the zero potential surface that is earth. Now a car with metallic body is a very good thing to provide that short route to the ground. Same concept as that of a "lighting rod" placed at the top of high rise buildings which attract the lightning towards it instead of the building concrete.\n\nI assume that you know that A PERSON WILL NOT FEEL ANY SHOCK UNTILL AND UNLESS THERE IS FLOW OF CURRENT THROUGH HIS BODY PARTS...\n\nWhen light strikes on the car top, it will get dispersed in all directions and flow through the frame to the wheel frames and then jump from there to the road through the wet tyres. This short jump (of around 8 cm height), in any case, requires less work than conducting electricity through highly non conductive air for height of about a car (120 cm).. or pass through you head and get out from your shoes...\n\nNow imagine yourself sitting in car... you are not in contact from the top... so when light strikes it has 2 options... either to jump  to your head or flow through the conducting car body... answer is obvious and it will pass through the car body...\n\nNow if my legs are touching the car floor then why not i get a shock then..? so answer again is that now when charge is at the floor it is having a zero potential surface below it and there is no point entering into your body and move unneccesarily upwards...\n\nHope you got it...
1039963
dammit.  i had a good answer and then i had to re-login after it was all typed out.  i lost the original reply.  here's a summary.\n\nu or v shaped.\n\nspinner or two in the hole.\n\n80-120 dekes.\n\nbriley extended LM\n\nfed 3.5" 1550 fps #2
494789
Nine bricks\n\nEight would leave you 3/8 inch short.
277831
that sounds dangerous.  someone could suffocate.
278796
Cool, I've never seen a smoke bomb that small. The pen thing could be kinda tricky though. Probably not worth the effort. Now if you burried one in someones cigarette they could just light the fuse themselves. That would be funny.