Recent content by DonnieD

thanks, yes i wanted to say that one, we can consider the vacuum the space-time? Hi tiny-tim! i'm not sure of this, if vacuum had a speed this would be always 0 in all the systems, therefore all would be in agreement with that Einstein said. I recognize that does not have much sense to...

i mean static, immovable, speed of vacuum is 0, in every reference system. sorry, i used an on line dictionary.

if we assume the light it is a wave that travels in the vacuum to speed c, then since the vacuum is firm regarding whichever reference system the light will travel to c in every reference system, for this reason?

thanks for all the answers, the discussion is very interesting. but, i wonder, isn't the concept of energy a mysterious concept also?

but the relativistic mass m=hv/c^2?? (not the rest mass m_0)

i think E=mc^2 and E=hv so dynamic mass of photon is m=hv/c^2 ??

c is 299 792 458 m/s without uncertainty? doesn't work the Heisenberg uncertainty principle for fotons?

someone can explain easy, where's the mistake?

let q=relativistic factor then F=q*m0*a (where m0 is rest mass and a=acceleration) if E=m*c^2 =>dE=dm*c^2 (i'm not sure about this) and dL=F*dx (is the infinitesimal work completed by an external strenght F on the system) F*dx=dm*c^2 => q*m0*a*dx=dm*c^2 => dm/m0=(q*a/c^2)*dx...