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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)
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