1. Not finding help here? Sign up for a free 30min 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!

I'm second guessing myself on Limits

  1. Sep 19, 2009 #1
    1. The problem statement, all variables and given/known data

    Can [1 - (U^2/W^2)]^(-1/2) equal 0?


    2. Relevant equations
    I don't think the other equations are needed.. This is just a tangent of mine from last Physics' lecture.


    3. The attempt at a solution

    I set the (U/W)^2 part to infinity.
    0 = 1 / sqrroot(1 - infinity)

    which is:
    0 = 1 / infinity*i

    I know (1/infinity) goes to 0, but does the (i) change anything other than make it not real? I'm not worried if it's real or imaginary at the moment.
     
    Last edited: Sep 20, 2009
  2. jcsd
  3. Sep 20, 2009 #2
    you're right it is a bit different however as you see you could always just square both sides which shouldn't make a difference to the limits and you'll still see that it limits to 0 (from the negative)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook