Let me explain the second question first.
if Einsteins theory says one thing theory of every thing won't say something different because theory of every thing is after all an attempt to reconcile quantum dynamics and general theory of relativity. So time travel is possible.
And coming to...
yes it is possible but not of bodies of everyday size. The nuclear force is what make them do that, and it is dominant over coloumbic only when the distance is less than some threshold as in atoms. This force is effect of release of energy because of reduced mass resulting when nucleons come...
hello everyone!
This is completely alright eah! First of all let us see the definition of perpetual motion.
wikipedia defines it as "Perpetual motion describes hypothetical machines that operate or produce useful work indefinitely and, more generally, hypothetical machines that produce more work...
I do not think theory of every thing is too far! Scientists were successful in uniting 3 of the four basic forces together. The only thing that stops them is gravity and the question is why is gravity such a weak force.
So weak that a bar magnet can dominate the force of huge Earth on a pin...
Because the horizontal velocity of the projectile is constant and the vertical velocity continuously decreases because of gravity and hence the distance the projectile traveled in a given time keeps on decreasing and horizontal distance remains the same. This results in a parabolic trajectory...
As BRUCE W points out what is the color of infrared waves? Of course it is irrelevant to talk about color when we do not perceive it, but what if we suddenly got the capability of sensing low energy photons. Then what? What would be the color of infrared. let's give it a thought.