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Homework Help: Vectors problem #3

  1. Sep 9, 2008 #1
    1. The problem statement, all variables and given/known data

    two vectors A and B have precisely equal magnitudes. For the magnitude of A +B to be larger than the magnitude of A-B by the factor n, what must be the angle between them?

    2. Relevant equations

    3. The attempt at a solution

    i dont understand this because a-b would equal 0. so wouldn't the angle just be 0 degrees?
    Last edited: Sep 9, 2008
  2. jcsd
  3. Sep 9, 2008 #2


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    Homework Helper

    Hi BeckyStar678,

    The vectors [itex]\vec A[/itex] and [itex]\vec B[/itex] have the same magnitude, but [itex]\vec A-\vec B[/itex] does not equal zero unless they point in the same direction. You have to use the rules of vector addition to write out what [itex]\vec A+\vec B[/itex] and [itex]\vec A-\vec B[/itex] are.
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