1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Relative speed between two objects

  1. Oct 26, 2008 #1
    1. The problem statement, all variables and given/known data
    Two jets of material from the center of a radio galaxy are ejected in opposite
    directions. Both jets move at .750c relative to the galaxy. Determine the speed
    of one jet relative to the other.


    2. Relevant equations
    u'x = ux-v/1-ux(v)/c^2


    3. The attempt at a solution
    u' = -.750c - .750c/1-(-.750c)(-.750)/c^2

    Is this the right start?
    Thanks,
    Kevin
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 27, 2008 #2
    Yes, although you might wanna take the absolute value in the end to get a relative *speed*, rather than velocity.

    I'm assuming here you meant to put some brackets in the right places.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook