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

Another retarded question

  1. Feb 29, 2008 #1
    Let's assume we have two "somethings" in space, they get away from each others. The speed of one of them is around 150,000kms/sec, very fast but less than the speed of light, the other one goes the totaly opposite way at 200,000kms/sec.

    An observer on one of these would see the other element "going back in time" wouldn't he?
     
  2. jcsd
  3. Feb 29, 2008 #2

    malawi_glenn

    User Avatar
    Science Advisor
    Homework Helper

    no, he would just se the other ones clock go slower than his own.
     
  4. Feb 29, 2008 #3
    Wouldn't the observer see the other object flying away at the speed of light? No matter what the speeds of the two objects are their speeds can never add up to more than c, right? So his clock would be moving at normal speed and he would see the other object's clock either stop if it was receding at c, or moving extremely slowly if it was receding at less than that, correct?

    Would this observer see the other object moving away at c or slightly less?
     
  5. Feb 29, 2008 #4

    malawi_glenn

    User Avatar
    Science Advisor
    Homework Helper

    Use addition of velocity theorem and time dilation theorem.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Another retarded question
Loading...