1. ### Time's arrow

what of this arrows are result of other? for example why the the thermodynamic is result of cosmology time arrow?
2. ### What is the meaning of time?does time meaning without motion?

what is the meaning of time? does time meaning without motion?
3. ### Time's arrow

does the various arrows of time correlated? or how many of them are correlated? 1-arrow of time in radiation 2-thermodynamics arrow of time 3-cosmology arrow of time 4-quantum mechanical arrow of time 5-CP violation in weak interactions (!?) whats do you thinks?
4. ### Frequency of electromagnetic radiation of an accelerated charge

we know the total power of radition Radiation from an Accelerated Charge is p=2/3 (k e^2 a^2)/c^3 but what is the frequency of such radiation? and is that for the all observers the same?
5. ### Quantum mechanics and the speed of light

in hydrogen atom we write: mv^2/r=(ke^2)/r^2 then for r < (ke^2)/mc^2 the speed of electron must be fast than light to be in this area. but in quantum mechanics we have some probbility to be there. thus in quantum mechanics we have some probbility to have speeds big than light. is...
6. ### Relativistic collision and max energy

yes.but I can't solve this problem by very much algebra. I don't reach any logic result. please give me a mathematic result.
7. ### Relativistic collision and max energy

to the other particle.
8. ### Relativistic collision and max energy

a relaticistic particle collide with another rest particle. what is the maximum energy transmitted to the particle after collision?
9. ### If tachyons existes, does they obey the transfomation relations

if tachyons existes, does they obey the transfomation relations similary to the relations of special relativity? that we see in discussitions about tachyons , usually relations are same by a difference in compelexility of mass and charge . but the velocity in denominator is same, here the...