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Magnitude and angle of the displacement vector

  1. Sep 16, 2009 #1
    1. The problem statement, all variables and given/known data

    The minute hand of a wall clock measures 14 cm from its tip to the axis about which it rotates. The magnitude and angle of the displacement vector of the tip are to be determined for three time intervals. What are the (a) magnitude and (b) angle from a quarter after the hour to half past, the (c) magnitude and (d) angle for the next half hour, and the (e) magnitude and (f) angle for the hour after that? Give all angles as positive values measured counterclockwise from the +x direction (to the right, or 3 o'clock).

    2. Relevant equations



    3. The attempt at a solution

    I have no idea how to approach this problem. I am confused on the wording of part B..Help anyone?
     
    Last edited by a moderator: Jul 17, 2014
  2. jcsd
  3. Sep 16, 2009 #2

    rock.freak667

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    Re: Vectors

    well it means that 2:15 to 2:30, you want the angle made from going from 2:15 to 2:30 by the hand
     
  4. Sep 16, 2009 #3
    Re: Vectors

    so wouldn't that angle be 90 degrees? I put that, but It was not correct.
     
  5. Sep 16, 2009 #4

    rock.freak667

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    Re: Vectors

    that is 90 degrees measuring clockwise, the question said to measure counter-clockwise from the +ve x direction.
     
  6. Sep 16, 2009 #5
    Re: Vectors

    so 270?
     
  7. Sep 16, 2009 #6

    rock.freak667

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    Re: Vectors

    that is what it looks like it should be
     
  8. Sep 16, 2009 #7
    Re: Vectors

    hmmm..
     
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