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Finding the position on a circle.

  1. Sep 23, 2015 #1
    1. The problem statement, all variables and given/known data

    Someone runs on a circle in the direction of a clock. He goes at constant speed. The circle is put in a xy plane that is centered at the origin. The radius is 10 m. At a certain moment he has a speed of (3i + 3j) m/s. Determine the position at this moment. (in vectorial notation)
    2. Relevant equations
    a^2+b^2=c^2

    3. The attempt at a solution

    3^2 + 3^2 = 18
    4.24
    Square root ( 18) = 4.24 m/s


    Last question for tonight, I promise.
     
  2. jcsd
  3. Sep 23, 2015 #2

    phinds

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    The question asks for a position and you have specified a speed as your answer.
     
  4. Sep 23, 2015 #3
    Yeah, but we need to find the lenght of the vector of the speed to be able to find the position, no ?
     
  5. Sep 23, 2015 #4

    phinds

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    What do i and j represent?
     
  6. Sep 23, 2015 #5
    Oh, IM really sorry. i and j are vectorial units.
     
  7. Sep 23, 2015 #6

    phinds

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    units of what? What I'm trying to get here is for you to specify more clearly just what it is that you know. You really should draw a picture.
     
  8. Sep 23, 2015 #7
    It's m/s
     
  9. Sep 23, 2015 #8

    phinds

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    We're really getting nowwhere here. Draw a picture showing what you know and what you are tying to find out.
     
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