A metal spring is compressed and tied with acid resistant wire. The spring is dropped in a jar of acid.?
459162
Potential Energy----->Kinetic Energy-----> Heat Energy\n\nIn compressed metal spring, the molecules in the spring comes closer due to pushing and the repulsive force between them is greater than that compared to uncompressed spring.\nSo when the spring is eaten by acid the molecules separate at higher speed than that in uncompressed spring.This extra Kinetic Energy is equal to the Potential Energy stored in compressed spring. The speeding spring molecules collide with acid molecules and this raises the acid temperature.\nThis heat energy is equal to the stored potential energy.
72779
A molecule is made up of atoms.
794120
you could take a straw and heat to just before the melting point where it starts to get soft. you could also use a small gauge (meaning the wire is thick) and bend that. Then attach the tube worm to that so it looks like some of it is sticking out.
150659
You may be referring to a sacrificial anode?\n\nSometimes, in order to prevent something from rusting (like a metal water pipe or the hull of a ship), you sacrifice a more reactive metal to corrode first.\nFor example, if you wanted to protect an Iron water pipe from rusting, you could electrically conect it to a "sacrifical" piece of Magnesium (a more reactive metal)m this way, the Mg will corrose first, keeping the Iron safe.\n\nEdit:\nYou wouldnt mix the sacrifical metal in with the metal your trying to protect, then you'll just get an object with a bunch of holes in it (where the other metal was eaten away).  You would electrically connect the sacrifical electrode to the other metal with a wire or something of that sort, then as the sacrificial electrode is corroded away, the other metal stays perfectly intact.\nI think in real life Magnesium is a very common metal to use since it is so high up in the reactivity series and not insanely expensive. Silver doesnt corrose very much at all, it wouldnt work as a sacrifical electrode, not would it need one very badly.
41902
usually 18-20 gage steel wire. though you can get them in plastic and or various other metals aluminum and or titainium for example though i cant see why youd want them unless you were to use them for a VERY non standard application
852384
I can't help you with the first question, but to figure out the second one you just need to use Hooke's law (I'm assuming the spring to be almost perfectly elastic.) In equation form the law looks like: F=k*x\nWhere F is the force applied, k is the spring constant, and x is the deformation.\nThe force applied will be the objects weight, so 9.8*.5=4.9N, and the deformation is .04m.\nSo 4.9N=k*.04m\nk=4.9N/.04m\nk=122.5N/m
557678
Ah ha.  Thermite.  Magnesium ribbon would be the usual method to start this reaction.\n\nBe careful with this reaction...
259261
with a coil, like springs everywhere (except leaf springs of course).
135302
A spring is just a piece of coiled steel. The steel is of special grade, but nevertheless it is a form of steel.\n\nAs such when you pull it and release it, it 'springs back' to essentially the same state and length.\n\nIf you compress it and release it it does the same thing.....goes back to essentially its same state and length.\n\nIts force it opposite to the direction it is stretched/compressed, so its force is given by (Hooke's Law...which isn't really a law):\n\nF = -kx\n\nThe negative sign signifies that the force goes in the opposite direction to the direction the spring stretches.\n\n"k" is the spring constant.\n\nThis is a number that is found experimentally and is unique to every spring.\n\nYou see.....not every single spring is exactly the same as every other spring, even tho they may appear to be the same.\n\nSlight variations in coil diameter, strength, length, and the like, add up to make each one a little different.\n\nAn ideal spring is one that always return to the exact same length as it is in an unstretched condition. It is also one that offers the same force of resistance to a compression or being pulled. And it is one that never gets weak and wears out.\n\n\nDoes this help you?
546333
It hasn't been exposed to air yet. It takes air to harden.
837447
PROBLEM ONE\nThe electric resistance R of a wire varies directly as its length L and inversely as the square of its diameter.  So you mean R=cte*L/d2 where the constant depends on the metal used.\nfor that alloy, C=Rd2/L=36*0.6*0.6/20=0.648\nIn the second wire, you use the same constant\nR=0.648*60/(1.2*1.2)=27 ohms\n\nPROBLEM TWO\nhere, period=T=cte*sqrt(L)\ncte=T/sqrt(L)=2/sqrt 6=0.816\nL=(T/cte)2=(1/0.816)2=1.22*1.22=1.5
763604
a) The stress in the wire is given by force per unit area = m*g/A\nIf Y is the Young's modulus of the material of the wire, \nY = stress / strain. Therefore \nstrain = stress / Y.\nElongation = strain*original length.\nb) When the object is accelerated upward with an acceleration of a, the force acting in the wire = m*(g+a)\nThe rest of the equations above are valid.\nc) If the elastic limit of the wire is E, the greatest mass that can be accelerated up with an acceleration of a is got from \nE = Mmax*(g+a). Hence\nMmax = E/(g+a)
1030054
You would find, if you had a sensitive enough measuring system, that the energy is dispersed through the acid as heat. \n\nWhen acid oxidises metal there is an initial activation energy required to break the metal lattice and that energy nromally comes from the heat already in the system. When the lattice is under stress sit requires far less energy to break down and the activation energy is lower. That means that more heat is retained by the system as heat.\n\nYou can see for yourself that a metal lattice under stress breaks down and oxidises more readily by simply bending an iron nail and dropping it in a few mm of salt water for a few days. The iron will rust almost exclusively where it was bent. That is because the  bend represents a point of stress in the lattice.\n\nWith less energy required to break down the metal alttice the overall reaction becomes more energetically positive and the amount of heat in the system increases.\n\nThe amount of additional heat this represents is tiny, but with an incredibly stable atmosphere and a very sensitive thermometer you would regeister the lost energy as a higher temperature than an identical beaker of acid with an uncompressed spring.
665462
1) you can mix salt in waer, aach 2 wires to a battery and a ligh bulb apparatus and show how it lights up\n2)show the effect of acid on bones by letting a bone sit in a soda soluion for a few hours in a closed container\ntheres many more but it depends on materials and budget plus level of course
87397
As I understand it-- the electricity agitates the electrons of the gas- the color is from the color the maker coats the inside of the tube with.
882220
pretty sure its a metal.\nhope this helps. :)
785808
usually protein with some metallic ions