I know the
fat has 9kcal/g and
carb has 4kcal/g
If E=mc^2, then E ∝ M
that means both fat and carb should have same energy.
But why they don’t?
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I know the fat has 9kcal/g and If E=mc^2, then E ∝ M that means both fat and carb should have same energy. |
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E=mc 2 only deals with the energy of photons. |
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Originally posted by FuzzyBacon: Oh, problem solved. Thanks! |
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the problem here is that you don’t actually destroy the entire mass of the fat and the carb. you burn it, which means you don’t actually destroy the mass but convert it to an other kind of mass. if you could mesuare it very closely, you would notice that, when burning the carb/fat, a very tiny amount of mass would disappear. however, this is by far not enough to be noticable. not even by the most accurate equipment. Originally posted by FuzzyBacon: not entirely right. E=MC^2 deals with converting mass to energy or energy to mass. photon energy was an other formula, I don’t know it for sure but it had something to do with the frequency. |
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Isn’t it either E=hv or E=h(c/λ)? It’s one of those two, I’m sure. |
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Homework thread? |
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This is Einsteins theory of special relativity. E = Energy, m = mass and c= constant (speed of light) with both values squared! It can be written mathematically as Energy = (mass x speed of light) x (mass x speed of light) |
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E=mc^2 does not apply to photons, because photons have no mass. the energy from carbs/fat/etc is not total energy, though. those numbers are just the amount that you can extract from them. also, m is not squared. |
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also also, m is relativistic mass, not “regular” mass. I find that wording somewhat confusing. |
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Originally posted by darkfrogger: Wait, what? Mass is a constant. Are you thinking about weight? |
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mass is not constant. it depends on how fast the object is moving. at low speeds, the change in mass is too small to notice, so in newtonian mechanics, it is treated as constant. think about it this way: |