View Full Version : Relativistic mass "exponentiality" near c

2009-Jun-30, 08:35 AM
An observer watching (and remotely measuring) an object accelerate from rest up to near c would notice its mass...

(a) linearly increase all the way to c (graduation metrics needed)
(b) linearly increase; then exponentially increase at some speed near c
(c) other

2009-Jun-30, 08:58 AM
Well, you could just take the equations for the relativistic correction of the mass:

m(v(t)) = γ(v(t)) m0

and then plug in for the velocity:

v(t) = a t

and then basically you have look at gamma because m0 does not change (obviously) and you have

γ(t) = (1 - a2 t2 / c2)-0.5

so the answer would be (c) other.

2009-Jun-30, 09:50 PM
Looks like a homework problem!

Tobin Dax
2009-Jun-30, 10:15 PM
Looks like a homework problem!
I just ran a "spidey-sense" test. If tusenfem is plagiarized, his post can be found using Google.