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In the other case it will take a infinite energy, according to Einstein, to gain that 'ftl' speed, actually not ever reaching 'c'.
Quote from: yor_onIn the other case it will take a infinite energy, according to Einstein, to gain that 'ftl' speed, actually not ever reaching 'c'. I derived an expression for the relativistic mass of an object herehttp://home.comcast.net/~peter.m.brown/sr/inertial_mass.htmRelativistic mass is the quantity m such that p = mv. That derivation shows that as v -> c, m -> infinity as does the momentum p.
The speed of light in other materials is lower than the speed of light in a vacuum...
Couple years ago I made real-time special relativity mass calculator:http://www.ultimate-theory.com/en/2012/12/26/special-relativity-mass-calculatorYou can enter mass of object, and velocity (either with units m/s, km/h or fraction of c), and instantly (while entering) see how relativistic mass, and Lorentz factor is growing..