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E=mc²
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How did he know it was light? I mean i wouldnt be too surprised if he put it this way: E=m(3×10^8)², in a world where the nuclear bomb came before the E=mc² discovery thing, and they just set the numbers based on observation. Please forgive me if this question is actually really stupid but im asking you guys this question with sincerity. I read a couple of articles but I still couldnt find out why. Im no physics student or something, im just too curious.
love & peace
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Re: E=mc²
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by
on 2009-03-13 16:03:41 (edited 2009-03-13 16:06:12)
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How did he know it was light? I assume "he" is Einstein and "it" is the constant c = 3*108 m/s. The speed of light was first accurately measured in 1676 by Ole Christensen Rømer. More importantly, Einstein was familiar with the already tried-and-true Maxwell's Equations. These equations accurately and precisely defined the constant c as the speed of propagation of electromagnetic waves in a vacuum. Now, imagine that this was well known science to Einstein, but nobody at the time had ever been able to solve certain paradoxes, such as the moving magnet and conductor problem. The genius of Einstein is evident in his theory of special relativity, in which he solves this and many other fundamental problems of physics in his spare time while working as a patent examiner. To read more information about the development and ideas behind the nuclear bomb, click here. 
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Re: E=mc²
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In truth it is not all that difficult of a concept, or at least now that we know about it. E=M(C^2) is taken from F=MA If you replace the A, for acceleration, with the fastest thing in the universe C, light, then you get an equation that pretty much asks how much force does it take to get something moving at the fastest speed possible. Since there is no higher acceleration than the speed of light, it is not possible to put more energy into the object and it has obtained all the energy it can hold, and there by the E represents how much energy is in the M. This, however, does not mean that if you have two objects you can get one to the speed of light simply by converting the other to pure energy. The equation specifically points out that E=M. Meaning that as you add energy to an object you also add mass, meaning you have to add more energy to accelerate it, there by increasing it's mass again. The cycle just repeats and the speed of light is never acheived. In other words, if you take two objects and convert one into energy the equation is A=(Mass of converted object*(C^2))/(Mass of both objects), A=E/(M1+M2) YES, I CALL THIS SIMPLE |
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Re: E=mc²
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by SuicidopoliS
on 2009-08-14 02:43:50
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If you replace the A, for acceleration, with the fastest thing in the universe C, light, then you get an equation that pretty much asks how much force does it take to get something moving at the fastest speed possible. Replace an acceleration by a speed, and still pretend it'll give you a force... I hope you never did that on your physics exam. .oO° Life's THE CURE, the rest are details! °Oo. |
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Re: E=mc²
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A small typo on my part, A has to be replaced with (C^2). (It was 3am my time, give me a break, lol.) Despite my small blunder, the pricipal is still the same. EVEN EINSTEIN WAS DISLEXIC. |
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Re: E=mc²
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| If your earlier statment is true, then explatin the phonton which always opperates at the speed of light has no rest mass but RELATIVE mass. |
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Re: E=mc²
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A photon is a packet of energy and energy has mass, or at least behavies like it. Photons always move at the speed of light, not to mean that the speed of light is the same through all mediams, but the energy a photon has can varry. For example, ultraviolet light holds more energy than inferred. When the photon interacts with an object it applies a force, it can vibrate a molecule for heat or knock an electron out of orbit. The amount of energy it has determins how much force it can apply and thereby determins how much relative mass it has. Just flip the equation around to have M=E/C^2 with the E being how much energy the photon holds and M being it's relative mass. However, because a photon is nothing but energy it cannot change it's natural speed and con only reduce how much energy it contains, it cannot rest and has no rest mass. EINSTEIN'S EQUATIONS SHOWS THAT ENERGY HAS MASS, BUT ENERGY AT REST HAS NO MASS, SO ENERGY CAN ONLY HAVE MASS WHEN IT IT IS MOVING, AND ALL MOVING THINGS ARE RELATIVE. |