Recent content by kevinki

Definitions: Astronaut is A Person on Earth is B A travels to a star far away at near light speed, A would see B's time dilate. B would also see A's time dilate Twin paradox revived: What would happen if A returns to B at a very slow speed? Then both frames of reference would see each others'...

This makes it clearer Yes, I did get it messed up. I THINK to sum it up: With the Doppler effect you assume that the receiver is static (therefore + and -) With the Galilean Transformation you assume the environment is static (therefore fixed cartesian co-ordinate systems) I think when you get...

I think it will be when we are able to harvest the energy of matter (E=mc^2) (which is a lot)

I'm getting quite stuck on this problem here. Galileo said that Xb = Xa - V*Ta. (This follows from dv = dx/t --> Xa - Xb = t*dv --> the above formula) Thus, it is concluded Xa = Xb + V*Ta, but why? In my thought experiment the objects are moving relative to each other, thus if A is moving away...