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2-Dimensional Motion (non-trajectory)

  1. Sep 19, 2009 #1
    1. The problem statement, all variables and given/known data
    A kayaker 120 m east and 350 m kayaker is moving with the current at 2 m/s to the south. He begins to paddle west, giving the kayak an acceleration of 0.2m/s^2.

    I need to find all the components for two events.. t1, t2, rsub1x,rsub2x,rsub1y,rsub2y, vsub2x, ect... up to a(sub12x) a(sub12y)


    2. Relevant equations
    Two vector equations :

    d=Vnot0 +1/2at^2
    V=Vnot0 +at


    3. The attempt at a solution

    Im guessing his location from his house is irrelevant(this problem has no "question").
    I added the two vectors using 15s as my time and used pyth: 2^2 + (45/2)^2=d^2 and got 22.6m as the displacement.

    Then i added the initial velocity 2m/s and the acc/time .2m/s^2(15s) and got 3.6 m/s as the final velocity.

    I'm still confused with components and vectors. Is this right? How do I go about finding the components?
     
  2. jcsd
  3. Sep 20, 2009 #2

    tiny-tim

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    Hi joeG215! :smile:

    (there seem to be some words missing from the question :confused:)
    No, you don't need the displacement …

    just use the components …

    you have a constant speed south, and an acceleration west. :smile:
     
  4. Sep 20, 2009 #3
    lol thats what it looks like I know.. Ill try a link to the question --> http://file.taskstream.com/file/bclp85Uht2h0HjqkivMmdw75My3rhxcWnd3judYv9tl7Ma7stwRa8t2scNy6977cOacou3bFvb98bdWcm63scD49n0adLevxpyAuveeabYa5cbubReeqoddZm5grycZ0gxo0U7bygabXb9ci/2d_Motion_Modeling_Task_9_16_09.JPG" [Broken]

    If you can point me in the right direction that would be great.. Thanks
     
    Last edited by a moderator: May 4, 2017
  5. Sep 21, 2009 #4

    tiny-tim

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    erm :redface:
     
    Last edited by a moderator: May 4, 2017
  6. Sep 21, 2009 #5

    lol ok.. Ill try one more time http://i393.photobucket.com/albums/pp13/j2bear15/2d_Motion_Modeling_Task_9_16_09.jpg" [Broken]
     
    Last edited by a moderator: May 4, 2017
  7. Sep 21, 2009 #6

    tiny-tim

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    ok :rolleyes:

    so the x is 120 and the y is 350 …

    you have a constant speed south, and an acceleration west …

    just use the standard constant acceleration equations :smile:
     
  8. Sep 21, 2009 #7
    can i assume initial velocity on the x to be 0?
     
  9. Sep 21, 2009 #8

    tiny-tim

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    Yes of course …

    if he doesn't paddle, his velocity is entirely 2 in the y-direction, so his initial x-component of velocity must be zero. :smile:
     
  10. Sep 21, 2009 #9
    ah ok thanks a lot tiny -tim !
     
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