Is the opposite of the formula e=mc2 also true? Can energy be convertedto mass? How?
102002
Sure, but as you can tell, it would take a whole lot of energy to make a little mass.  Just think atom bomb.
458495
The theoretical physics equation E = mc2 states a relationship between energy (E), in whatever form, and mass (m). In this formula, c², the square of the speed of light in vacuum, is the conversion factor required to formally convert from units of mass to units of energy, i.e. the energy per unit mass. In unit specific terms, E (Joules) = M (kilograms) · (299792458 m/s) 2.\n\nThis formula, which was discovered by Albert Einstein, proposes that when a body has a mass (measured at rest), it has a certain (a very large) amount of energy associated with this mass. This is opposed to the Newtonian mechanics, in which a massive body at rest has no kinetic energy, and may or may not have other (relatively small) amounts of internal stored energy (such as chemical or thermal energy), in addition to any potential energy it may have from its position in a field of force. That is why a body's mass, in Einstein's theory, is often called the rest energy of the body. The E of the formula can be seen as the total energy of the body, which is proportional to the mass when the body is at rest.\n\nConversely, a single photon travelling in empty space cannot be considered to have an effective mass, m, according to the above equation. The reason is that such a photon cannot be measured in any way to be at "rest" and the formula above applies only to single particles when they are at rest. Photons are generally considered to be "massless," (i.e., they have no rest mass or invariant mass) even though they have varying amounts of energy.\n\n\nENERGY=MASS x Speed square \n\n\nbtw  check out my website \n\nhttp://oldman.netfirms.com/
682752
In short, No. E=MC2 is Einsteins formula for explaining the rest energy of a body. Basically how much energy any object contains bundled within its atoms. He created this at the beginning of the 1900's. The first electrical devices were springing up in the 1600's - 1700's.
21836
The point of the equation is that mass and energy are different forms of the same thing.\n\nIf you want to learn more, I recommend this book by David Bodanis:\nhttp://www.amazon.com/gp/product/0425181642/qid=1134949784/sr=8-2/ref=pd_bbs_2/002-5095073-8904029?n=507846&s=books&v=glance\nIt's easy to read, and it starts with the basics - what's mass, what's energy, what's the speed of light.
475765
oh, wow, this is a physics question.\n\nto start, we remember E = mc^2\nthe problem gives 4 grams matter and 2 grams antimatter.\nmy solution would be that 2 grams of matter and 2 grams of antimatter annihilate to produce 4c^2 (2 + 2 = 4) energy.\nthe excess 2 grams of matter remains unaffected.\nthe answer is D.
154286
Hound, did you intend this:\nE=Ea+Eb = (m^2) * (c^4) + (p^2) * (c^2)\nThis makes E = Ea^2 + Eb^2, no?\n\nAlso, an alternate, simple-minded, non-relativistic answer to why does KE = .5MV^2:\nE=F*D (Energy, Force, Distance)\nF=M*A (M is Mass, A is Acceleration)\nE=M*A*D \nD=.5*A*T^2 (T is time)\nV=A*T\nE=M*A*.5*A*(V/A)^2=.5*M*V^2
8298
In the formula, E stands for energy, m stands for mass, and c-squared is a constant factor equal to the speed of light squared. The formula indicates that large quantities of energy can result from tiny amounts of mass if the mass is completely changed into energy. Developed by Einstein.
1055212
E=mc²\n\nOne of the most famous equations in the world, even to non-physicists, the theoretical physics equation E = mc2 states a relationship between energy (E), in whatever form, and mass (m). In this formula, c², the square of the speed of light in vacuum, is the conversion factor required to formally convert from units of mass to units of energy, i.e. the energy per unit mass. In unit specific terms, E (joules) = M (kilograms) multiplied by (299792458 m/s) 2.\n\nMeanings of the formula\nThis formula, which was discovered by Albert Einstein, proposes that when a body has a mass (measured at rest), it has a certain (very large) amount of energy associated with this mass. This is opposed to the Newtonian mechanics, in which a massive body at rest has no kinetic energy, and may or may not have other (relatively small) amounts of internal stored energy (such as chemical energy or thermal energy), in addition to any potential energy it may have from its position in a field of force. That is why a body's rest mass, in Einstein's theory, is often called the rest energy of the body. The E of the formula can be seen as the total energy of the body, which is proportional to the mass when the body is at rest.\n\nConversely, a single photon travelling in empty space cannot be considered to have an effective mass, m, according to the above equation. The reason is that such a photon cannot be measured in any way to be at "rest" and the formula above applies only to single particles when they are at rest. Photons are generally considered to be "massless," (i.e., they have no rest mass or invariant mass) even though they have varying amounts of energy.\n\nThis formula also gives the quantitative relation of the quantity of mass lost from a resting body or an initially resting system, when energy is removed from it, such as in a chemical or a nuclear reaction where heat and light are removed. Then this E could be seen as the energy released or removed, corresponding with a certain amount of mass m which is lost, and which corresponds with the removed heat or light. In those cases, the energy released and removed is equal in quantity to the mass lost, times the speed of light squared. Similarly, when energy of any kind is added to a resting body, the increase in the resting mass of the body will be the energy added, divided by the speed of light squared
83538
E=m*c*c is one of the most famous formulae that exist. It is actually not the full formula, which is \n\nE^2= (m^2)( c^4) + (p^2 )(c^2)\n\nbut for an object at rest, momentum p=0, so we get the familiar equation. Here c is the speed of light in a vacuum, which is the speed limit for our universe (nothing can go faster than the speed of light, according to the special theory of relativity). \n\nThe equation E=mc^2 describes the amount of energy that can be released when matter of mass m is converted to energy E, as in a nuclear power plant or nuclear weapon. \n\nIt arrived as a consequence of Einstein (and other physicists at that time) considering what would happen if you moved very fast, close to the speed of light. This lead to the special theory of relativity, which made all kinds of wild predictions:\n\n1. As you go faster, your mass increases\n2. As you go faster, you shrink, front to back\n3. As you go faster, time travels slower. \n\nThe details get pretty complicated, but I have attached a PBS web site where you can listen to some interviews with famous physicists about what they think about E=mc^2.
8321
The theoretical physics equation E = mc2 states a relationship between energy (E) and mass (m) first formulated by Albert Einstein in his 1905 paper "Ist die Trägheit eines Körpers von seinem Energieinhalt abhängig?" ("Does the Inertia of a Body Depend Upon Its Energy Content?", published in Annalen der Physik on September 27), one of the articles now known as his Annus Mirabilis Papers.
339047
It is just a reference to E=mc^2.  It can be through fission or fusion, so yes you are surely correct.
974824
E is energy.\nm is mass.\nc squared is the speed of light squared.\n\nThey had a TV show on PBS about Albert Einstein yesterday. You just missed it! \nE=mc squared is Einstein's "theory of relativity".
1168590
Let's look at E = mc^2.\n\nE is energy. It is measured in joules.\nm is mass. It is measured in kilograms.\nc is the speed of light. It is measured in meters per second.\n\nKilograms multiplied by (meters per second)squared are joules. If you don't have a mass multiplied by the square of a velocity (or something with equivalent units), you don't have energy.\n\nThe maximum speed any mass can have is infinitesimally less than the speed of light. c^2 would be the square of that speed.\n\nNow, let's consider the practicalities. Experimentally, we find that, as we accelerate something very close to the speed of light (which is done every day in particle accelerators, for example), it becomes harder and harder to accelerate the closer it gets to the speed of light. E = mc^2 is the energy of a mass at rest; this is where the energy of nuclear weapons and nuclear power plants comes from. As an object moves, its energy is multiplied by a factor usually abbreviated with the Greek letter gamma; its value is:\n\ngamma = 1/[1 - (v/c)^2]^1/2\n\nSo it's 1 over the square root of [1 minus (v/c)squared].\n\nAs v becomes closer and closer to the speed of light, v/c becomes closer and closer to 1, the denominator of the fraction becomes closer and closer to zero, and gamma becomes larger and larger. If v were to equal c, gamma would be infinite. This is why you can't accelerate any massive object to the speed of light - it would take an infinite amount of energy. \n\nSo, you may ask, what about photons? They go at the speed of light, don't they? Indeed they do. They manage this because their mass is zero, and they can never travel at any speed other than the speed of light.\n\nIncidentally, it is indeed true that m = E/c^2; this is often useful in physics calculations.
462106
Its called "law of conservation of Energy".. \nYou can covert matter of mass M into energy  (and energy will be MC^2).. but you can not create either.\n\nEnergy will chenge from one form to another form like heat, work, pressure...etc. All these are one way or the other  form of energy.\n\nFundamental concepts of classical physics will give you much better idea about this concept.Try it!
289580
E is Energy\nm is mass\nc is the speed of light\nenergy=mass times the speed of light squared\nthis is the equation for Relativity.
125124
E=Mc^2 is not newtons 2nd law of motion\n\nEnergy = mass in kg * the speed of light squared which is in m/s\nThat is the full equation,it is by no means a proof but it is the equation\nNewtons 2nd law of motion is mass * acceleration,acceleration has units of m/s^2\n\nLight does not accelerate\n\nE= mc^2 is used to find how much erergy is required to create new mass,it is used a lot in particle physics
743150
There are three common equations dealing with time.  They are: E=mc2, m=E/c2, and c2=E/m.  The basis of each of these equations is the value of "c2".  This is the only value that does not change, and this is, by the way, the value of physical time.  In that the composition of our universe is that of "c2" it is impossible for mankind to escape this value, for our own composition is that of time.  All mass and energy average out to zero because of this value.  The only time that has ever existed to mankind, or ever shall exist, is physical time, and there is no manner of escaping it.