Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

How is mass density affected by speeds near c?

  1. Nov 12, 2009 #1
    basically what is the relationship between mass density at "zero" speed and mass density at speeds nearing the speed of light (0.98c,0.99c etc)

    in the form M = [tex]\gamma[/tex] Mo if possible

    Thanks a lot guys!
  2. jcsd
  3. Nov 12, 2009 #2
    sorry just saw that this should have gone in the H/W section :uhh:
  4. Nov 12, 2009 #3


    User Avatar
    Science Advisor

    Isn't that the answer to your own question?
  5. Nov 12, 2009 #4
    well, i mean i took a guess that it takes that form, but is gamma squared or cubed?...anything that could change the proportionality...you know :)

  6. Nov 12, 2009 #5


    User Avatar
    Science Advisor

    If by "mass density" you mean "relativistic mass / volume" then yes, gamma is squared:

    gamma = 2 means that a moving object has half the volume, but also double relativistic mass, so 4 time more "mass density".
  7. Nov 12, 2009 #6
    ah i see!

    thanks a lot, i think i will be frequenting these forums often in the future
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook