Friday, June 14, 2013 8:38:11 PM
@Kain1 Nope! Not trolling. In a vacuum, yes. BUT light is affected by gravity. And gravity is affected by density. And the speed light travels at does vary according to the medium (usually a vacuum of course).
My problem with the "gains mass" idea is that this would require easily changing energy into matter and then BACK, easily! Bzzt!
I think it's easier to change the speed of light (via density) than to convert mass & energy around. Just like I can "move the moon" eh?
The Energy increases, the Mass stays the same so the Speed of Light (squared) is INCREASED to keep it balanced...
I did get it "arse backwards" in my explanation below, it <increases> due to more density (gravitic effects). SPEEDS UP in a "relative way" eh? Again, it`s such a tiny number it`s incomprehensibly small!
Friday, June 14, 2013 7:24:40 PM
The falling book thing should have read: "bla bla bla.. (assuming a perfect vacuum)".. In a perfect vacuum, it's about 42 minutes to fall through the earth to the other side, only by the influence of gravity. Drag messes up all the beautiful math. Stop ruining the cool physics !..
5Cats: The entire theory of relativity is based on the assumption that the speed of light in a vacuum is a universal constant, and does not depend at all on how you`re moving through the universe, or what kind of field you`re in. So no, the speed of light doesn`t change.. therefore, the mass must.
If you compress a spring, you add potential energy to it by distorting the molecular bonds away from their ground state. when you release it, it jumps up, because the molecular bonds go back into their original configuration. This stored potential energy is still real energy, and still factors into the E = m*c^2 equation..