Darren New wrote:
> Tim Cook wrote:
>> Darren New wrote:
>>> Name energy that isn't in the form of mass?
>>> Then explain what E=mc^2 means.
>>
>> Light isn't in the form of mass.
> 
> Yes it is. Photons have mass. Indeed, the reason they go the speed of 
> light is (sloppily speaking) that they are *all* energy, so they *have* 
> to go the speed of light just to have mass to hold the energy.
> 
>> Sound isn't in the form of mass. 
> 
> The atoms move to make sound. Sound is kinetic energy, which is mass due 
> to relativistic movement.
> 
>> Electricity isn't in the form of mass.  
> 
> Electrons move, hence kinetic energy, hence mass.
> 
>> Magnetism isn't in the form of mass.  
> 
> Magnetism consists of photons. Photons have mass.
> 
>> E=mc^2 means that the amount of energy stored in a given mass can be 
>> determined by multiplying the mass by the speed of light squared. 
> 
> Equally, it says that the amount of energy can be determined by 
> multiplying the amount of mass by the speed of light squared. That's an 
> equal sign there. That's how relativity works.
> 
> Where does the kinetic energy in a moving asteroid go if I accelerate my 
> spaceship up to the same speed? Does the stationary observer see more 
> energy than the observer moving at the same speed? Wouldn't that mean 
> that energy can be created and destroyed at will, just by moving the 
> observer without changing the experiment? Do you understand why leaving 
> a gravity well makes you heavier?
> 
> I know what you're trying to say. You're trying to say that there is 
> energy that's not the equivalent of mass, and that E=mc^2 only applies 
> to mass, not energy.

No, I'm trying to say that...mass is a specific form of energy, as are 
all those other forms of energy, but they aren't each other.  Sound is 
not light, because it has defining properties that are different. 
Otherwise we'd just call everything 'energy'.  It's like...number sets. 
  Energy is the set of all numbers, mass is the set of all positive 
integers, light is the set of all negative primes, and so forth.  You 
can convert one to another with a bit of fiddling, but they aren't 
congruent subsets.

-- 
Tim Cook
http://home.bellsouth.net/p/PWP-empyrean

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