magnets melting metal?

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ElectroBOOM : Wow, are the eddy currents in that coin that strong to create that much heat? Impressive!

Benrob0329 : You're going to try to melt the bullet aren't you?

USWaterRockets : Would a strong enough magnetic field be able to melt the copper into liquid or maybe a plasma? This would make a cool explanation for how "energy shields" work on all the TV shows/movies/etc.

ֆהტϣ : Last video: "Melting a penny is illegal" This video: *Melting a penny*

Robert Leitch : Cody made the world's noisiest soldering iron

SandPox : Wow damn, I didn't even know this was possible

Cory Ory : How to solder without a soldering iron...

bexpi : Well that's one way to solder 😂

Mik : you basically made an induction heater, right?

Jerry Rupprecht : Looks like Cody’s making a new furnace.

Arno nümuss : Nice, you made a mechanical induction furnace :D

Peter Houle : haha literally demonetized

Peter Juncker : Real men would hold the penny in their hands.

Strongest Avenger : Video idea: Use noble gasses instead of regular air in a bicycle's tires and see how to works when you ride it.

Drew's Page : My mate Eddy Current seems to be at work here....

Franz Goerlich : Hey Cody I was thinking about grafting a tomato plant to a potato one. Theoretically it should work because the have the similar least worth trying :))

John Possum : A new way to solder. Unfortunately the lister engine/generator is not exactly portable.

Damian Reloaded : I wonder what kind of electromagnetic process would take away heat from the coin ?

Daniel Bolan : Hook this up to an exercise bike and you've got a human powered induction heater!

Newt : You're really trying to stop a bullet with magnets aren't you Cody?

Eric Juen : Were you using the heat generated trough induction of changeing magtic fields?

Erzgebirge erleben : Long awnser short. Bullet stopping is not going to happen... Nice demo, thanks!

The Puppet Of Everything : Cody you should try and make a Sterling engine out of something preposterous like a soda can.

Krzysztof Mazurkiewicz : Mythbusters tried the magbet thing and it failed... buuuut i think i see a contraption that uses alternating magnetic field to melt metal... I would love to see it :D PS if you would have some metal underneath it just close enough to the magnets.... would it melt? Would a "mechanical furnace" be possible?

ChemLab : What kind of magnets are those??

PsychoLucario : liquid nitrogen chilled bullets sound like an exploded bullet

Austin Randolph : Magnetic induction! The moving magnetic fields induce a current in the metal, which heats it up! I wonder if this effect is exacerbated by the fact that the penny is a combination of zinc and copper.

Bryan Roberts : Can you melt the bullet fast enough?

10mintwo : It's cool but you just know half the comments are going to be moronic "bu bu buh itz from muh friction when it scrapes!". maybe put a thin piece of plastic between or something?

AaronTheBlackDragon : I´ve seen something similar to this a long while back.

Super User : How's this even possible?

Erik Stinson : It would be more definitive if you managed to hold the penny still at a set distance from the flywheel. I'm not convinced that the frictional energy didn't have a significant impact on the increase in heat of the penny. You had it touching quite a bit, I'm also curious how fast the belt was moving, you mentioned it's not as fast as a bullet but I'm still interested. Great video though, I'm excited to see what you come up with!

Justin O'Brien : !

gertoh : it is really cool but it isn't persay the magnets that melt it as much as the electricity that the magnets generate

Eric Holden : Cool, just really cool. You should scale this up and see what you can do with it

T Saurus : 10,000% Mr Cody won't see this

ChemLab : wot

ChemLab : would you be able to heat up iron like that?

dontlikemath -.- : Nice.


FarmCraft101 : Curiosity question: Was there a lateral force on the penny during this? It seems that if the penny was just sitting there, rather than being held in place by your pliers, the magnets would have had the effect of pushing the penny laterally, like what occurs in an induction motor. So in that sense, was the heat generated not only by the movement of the magnets, but also equally by your resistance to movement of the penny through the pliers?

Kevin : Don't you mean electro magnet?

jopomeister : "Back in the day we all thought the end of the world was to be brought about by world leaders setting off nukes, but little did we know it was a humble backyard scientist who would bring our demise"

Nerys : You goddamn tease showing us that little bit and then stopping :-) that was pretty cool

Mikee Vee : Neat

Lagger Onesixfour : Welp, makes sense. Basically generating electricity in a conductor until it melts.

Douggernaut84 : Get out! No friggin way! That is very intriguing..

Ian Farquharson : Can you use a heavier bullet and less powder? I'm in England and apart from pull back the hammer/slide,point and squeeze, I have little knowledge about how firearms/amunition. ThankQ. TkEZ»UK

RWBHere : Remember that friction of the air on the bullet will also affect its temperature and velocity, and that it may already be hot as it leaves the gun, because of the explosive charge. You will not need quite as long a line of magnets as you think. For starters, how much will the projectile's velocity be reduced by per unit distance, and at a given point in its ballistic arc?For instance, if the bullet has a range of 900 metres when fired upwards at a theoretically optimum angle of 45°, then its velocity will be significantly less than the initial 300 metres/second after 300 metres, and it will take longer than 3 seconds to travel 900 metres. The effects of the Earth's gravity will also come into play if you fire the bullet upwards at any angle (as you have to do, unless your target is below the gun) and try to slow it down from a point above the gun. Finally, although the mass of the projectile will determine how much magnetic field you will require, as you no doubt know, but is it actually a solid bullet whilst in flight? Some higher speed, or lower melting point, projectiles (such as lead ones) can melt to a liquid, and solidify again later in flight, during which time they can begin to split into smaller fragments. Your findings should be really interesting, if you can find a viable way of controlling the path and velocity of a bullet. OTOH, it's far simpler to pass the projectile through several spaced-apart metal shields to stop it in a very short distance, as is done with parts of the ISS and smaller space debris. A demonstration of that process would also be really interesting, Cody. (Hint, hint!)

Jamie Kawabata : This got me to thinking, how does the force and energy change with speed? I have a hard time thinking about relative eddy currents, so let me assume it's similar enough to consider a generator with a low-resistance short circuit acting as a brake. Twice the speed produces twice the voltage and (for a fixed resistance) twice the current, for four times the power dissipated in the resistor. Four times the power loss at twice the speed means twice the energy loss per rotation, so the braking force is greater at higher speeds. I'm not sure what you mean when you say force increases asymptotically and the difference isn't all that great. It seems to me the force increases linearly with speed. I think this means the stopping distance is also linear with speed (unlike a constant brake which is quadratic with speed). This relationship is something that can be checked experimentally.