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

Two identcal spiral galaxies A and B w/ equal & opposite momenta merge

  1. Jan 20, 2007 #1
    Two identcal spiral galaxies A and B with equal but opposite momenta a and b are merged to form a resultant galaxy C with a net linear momentum c. Which is true?
    a) c>b
    b) 0<c<b
    c)c= abs(b)+abs(a)
    d) c=0
  2. jcsd
  3. Jan 21, 2007 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    As usual, you need to show work.
  4. Jan 22, 2007 #3
    Well, this question came in my olympiad. If I had got it, i wouldnt have come here. I am a student of 9th. So please at least tell which subject should I refer to.

    I think the resultant will be zero becoz there is equal and opposite momenta.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook