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/sci/ - Science & Math

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Anonymous 07/24/14(Thu)05:45 UTC+1 No.6661715 Report

I require assistance of the more enlightened science men. Lets say I want to heat an iron sword so that it melted. (melting point 2,800 degrees, assume 3,000 degrees for the question) The trick? I want to do it in under a second from room temperature to full melt. How hot would I need to make it?
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Anonymous 07/24/14(Thu)05:48 UTC+1 No.6661721 Report

>>6661715
Let me clarify. I want to touch it with an object that I can make as hot as I like. How hot would my fictional object need to be so the following can happen

I swing my object at this iron sword. As soon as contact is made the sword melts away (think light saber, but trying to melt something through pure heat, instead of jedi force crystal whatever)
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Anonymous 07/24/14(Thu)05:58 UTC+1 No.6661741 Report

>>6661715
ill take an educated guess also does not have to be exact.
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Anonymous 07/24/14(Thu)06:20 UTC+1 No.6661777 Report

>>6661715
bump ill see if anyone has any insights tomorrow.
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Anonymous 07/24/14(Thu)06:21 UTC+1 No.6661778 Report

>>6661715
There are way too many variables. The shape of the object (how much of it comes into contact with the sword), the material of the object, and how fast you want the sword to melt on contact (milliseconds? microseconds?) all make a very big difference.

For example, an infinitely sharp object would only have to heat up the part of the sword it makes contact with, so it'd take less energy than a bulky object that disperses heat to a large part of the sword.

No matter how you look at it though, your object wouldn't be in the solid state.
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Anonymous 07/24/14(Thu)06:27 UTC+1 No.6661786 Report

>>6661778
lets say its a sword fight, and you have an iron sword that wont melt for some reason (we are venturing outside the realm of the reasonable at this point) You want to melt the other sword in half in the half a second after contact. Regardless of any other effects, how hot would your sword have to be assuming normal conditions (if you need more specificity on normal conditions or anything else, feel free do dictate these things to make it eaiser for you.)
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Anonymous 07/24/14(Thu)07:02 UTC+1 No.6661851 Report

>>6661786
find average size of atom in sword
find average binding energy of atom in sword
approximate cross section area of sword/your object contact position
multiply average energy / atom by atom / unit area * total area of cross section

you have a very very rough lower bound on the energy transfer required

use relationship K=3/2kT where k is boltzmann constant and solve for T
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