can some one tell me what is E=MC2 .explain?

Answer 1

Energy = mass times (speed of light squared)
Units: Joules = kilograms times (meters /sec)^2

When a mass of 1 kilogram is converted to energy (usually by nuclear reactions), 9x10^16 joules of energy are produced.

Answer 2

This equation is often misunderstood because people associate it with the speed of light. Actually this equation has more to do with energy. But not just nuclear energy, this equation has to do with all energy.

Whenever something has energy, makes energy, uses energy, converts energy or has anything to do with energy this equation can be invoked.

For example, when you light a match and produce energy as light and heat you are converting just a little bit, a very tiny little bit of its mass into that energy. The amount of mass converted to energy is equal to the energy produced divided by the square of the speed of light.

Now, the square of the speed of light is a very large number so a very small amount of matter was converted into energy. The amount of mass in on the order of 10^-16kg. That’s 0.0000000000000001kg!

Suppose you have a spring and you compress it. The compressed spring has more energy than it had before it was compressed. If it has more energy it must also have more mass! How is this possible? You did not add any mass to the spring, all you did was compress it.

But, the equation E = mc^2 can also be written as c^2 = E / m. The speed of light is a constant. This means that it does not change. Well, it does not change so long as you keep it in the same medium. The speed of light is a constant in a vacuum. Say that again. The speed of light is a CONSTANT!

Now, look at the equation c^2 = E / m. If the energy of the spring is increased its mass MUST also increase. If it did not than the speed of light would not be a constant.

As with the burning match the amount of mass gained is very small, far too small to be measured. But, it can be calculated!

So, this famous equation reveals a richness to our universe that would otherwise go unnoticed.

Answer 3

E=MC2 is the "rest energy" of the particle.
Basically, this explains the maximum energy that an object releases at a certain mass.
This is also related to relativity when computing the relativistic kinetic energy,in which it limits the speed of the particle to less than 3.00x10^(8)m/s.
This famed equation is mostly used to compute on how much energy will a gram or more of uranium, or other reactiove materials will produce. So yes, this was a factor in making the first atomic bomb.

Answer 4

<>

This is just absurd. If you could "convert mass into energy", then energy could not be conserved.

This formula seems to attract people who know no physics to share their pseudo-expertise.

What the formula means is that the mass of an object is the energy of the object divided by the square of the speed of light.

In reactions in which the products fly off with increased kinetic energy, mass is conserved, but "rest mass" is decreased. The actual mass of an object is its rest mass plus a mass due to kinetic energy. In a sense, some rest mass is being converted into mass associated with kinetic energy, but both total mass and total energy are conserved.

Another poster wrote <>. This is totally wrong. What makes nuclear weapoms so powerful is that there are very strong forces in nuclei, which can result in pieces being ejected with lots of momentum. If there was no E= Mc^2 relationship, this would still be true. However, because of the E= Mc^s relationship, one can actually measure a decrease in total rest mass occuring. But this does not explain why the reaction produces high momentum products.

If one exploded some dynamite, qualitatively, the same thing would happen--there would be a small decrease in rest mass. But no one would claim that E= Mc^2 makes dynamite possible.

Answer 5

Its Einstein's equation that basically says that a small amount of mass (matter) is equal to a huge amount of energy.
Without worrying about the units:
- E means energy
- M means mass
- C means the speed of light (the ^2 means you multiply it by itself).
So this equation explains how you can get a huge bomb from the fission of a small amount of material - its what makes nuclear weapons so powerful, its what makes the stars burn so hot for so many billions of years.

Answer 6

It is a statement about the inherent energy in things.

Physics has long known that mass in motion has energy. KE = vm.

What Einstein proved is that even at rest, mass has energy. That energy can be calculated using E=mc^2.

When mass is converted to energy, such as in nuclear reactions, the amount of energy generated can be related to mass lost.

Answer 7

E = Energy
= is equals
m = mass
c = the speed of light
2 is the speed of light squared

Answer 8

Energy (E) = Mass (m, in kilograms) x c^2 (speed of light in a vacuum, in meters per second)

Answer 9

e = mc^2
e = energy
m = morning
c = coffee sqd 2

Answer 10

energy = mass times velocity squared which means the faster something is traveling the more energy it has