In a ballistics test, a crime lab shoots a bullet into water to be able to inspect the bullet after the gun fires it[Guns leave unique marks on the edges of bullets that are fired with them and this helps to identify the gun that fired a bullet.] Suppose a bullet of mass 40 grams is fired at 400 meters/sec into waterFor the purpose of this problem, presume that we have 10 liters of waterIf the bullet and the water both start off at 20 °C, what will be the final temperature of the water and bullet after the bullet stops moving and remains in the water? Presume that the bullet is made from aluminum (most are not, but we will take aluminum for this question).
first answer is trueif you fire a bullet into water 1 of 2 things are sure to happen1the bullet requochets of the surface due to the surface tension of the water2the bullet shatters on the force of impact trying to break the surface tensioneven an aluminium bullet will shatterBut then sometimes you do get one that dosnt shatter but willbreak surface tension and still be in one piece, but then the bullet would be so mangled you wouldnt be able to identify which gun it came fromMost tests like what you just said are shot into ballistic gel.
Oh, WOW! I think the only thing is at this point is to buy a new bladeYou need to take the Katana out of the Saya especially if the Saya is made from woodIt can take weeks to dry out completelyNow don't ever do the following on a new swordThis is just for the already ruined one since I do not think it can get any worseIt is also only if you have a cheap bladeIf you have an expensive blade you need to get it polished which is about $100 per inchFor a cheapie I have used a rust eraser to keep rust offClove oil to treat the blade for storing after you cleaned it is best but for a cheap sword I have also used WD-40 but never on my good bladesI have also treated really cheap blades with chrome polish as it leaves a protective coating on the blade and prevents finger prints and the sweat and oil from your hands to corrode the metalBut please don't do this with an expensive swordI have also known guys to use Never dull wadding polish once in a great while and again do not use this on an expensive or new sword eitherThese are only remedies for your already ruined sword you could try and I don't know if any of this will work or if the damage is too greatI offer no guaranteesI have a stainless steel kitchen sink and when it got clogged I dumped drain cleaner (which is acid) down the drain which in the process of the cleaning the plumbing threw back up into my kitchen sinkIt too stained my kitchen sink dark and nothing I have done to it shined it back upIt's permanent and eventually I will have to get a new oneSo if your sword is (stainless) steel I do not hold out much hope for itMore than likely the acid etching is permanent.
