Quote:
Originally posted by MBroderick:
How about I take a perfect box filled of a perfect reflective material, and shoot into it a beam of light. I then close the box. The box doesn't move , and thus the system is stationary with concern to momentum. Will the box not gain a very small amount of mass?
there is already something close to this. its called a black hole device. basically its a cylinder that is as close to perfectly reflective inside. a beam of light enters though a small hole near in such a way that it bounces around the cylinder always going in a circle. since it cant get a angle to hit the hole without hiting a mirror that would bounce it back in, it has to keep going. unfortuantly i dont know alot of the test that were done with it.

the more man learns, the more he realises, he really does not know anything.