everyone knows, E= MC^2 + PC^2 but does that apply to spinning objects? when i was small, i always was under an impression that you can create more gravity when you spin the object(well, not classical physics fast) i mean, the displacement is 0, so wouldn't the velocity= 0 and if really gets that fast, wouldn't the center be moving in time at a much more slower pace? sorry, i have alot of questions, answering any would do or even just pointing me to the right google search! thankyou oh, and just how much mass do you gain when you go to close to C? and porportional to that, how much gravity would you be making just by spining?