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Homework Help: Analytical geometry

  1. Jun 15, 2009 #1
    1. The problem statement, all variables and given/known data

    http://img23.imageshack.us/img23/8680/68366634.gif [Broken]

    1.2.1 only!!!!
    2. Relevant equations

    3. The attempt at a solution

    mRN= -1/5
    ref angle=11.32


    is it correct?
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Jun 15, 2009 #2


    Staff: Mentor

    I don't think so. The problem asks for [tex]\hat{R}[/tex]. The caret (or "hat") is usually interpreted to mean a unit vector, but that's probably not what is meant here, since the magnitude of any unit vector is 1. I think that what is asked for is the magnitude of the vector from O to R. You seem to have calculated the measure of angle PRQ. Since it's not clear to me what [tex]\hat{R}[/tex] is intended to represent, it's unclear to me what this problem is asking you to do.

    Your calculation of the slope of PR is correct, but this isn't:
    You can say that arctan(1/2) = 26.57 degrees, or that tan-1(1/2) = 26.57 degrees, where both are approximations.
    Last edited by a moderator: May 4, 2017
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