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How much does the raft move with change of position?

  1. Apr 14, 2015 #1
    • HW Template missing as it was moved from another forum
    heres the problem...
    upload_2015-4-14_9-20-19.png

    and i figured out part a but dont understand how to get the second part, here is what i have done...
    upload_2015-4-14_9-21-49.png
    my question is should the angle be from the point of origin? what im getting is -2.12 meters in a direction of -45 degrees. is this correct? I'm using x2-x1/y2-y1 to get 1.5/-1.5 then using Pythagorean to get the distance of shift and using arctan(-1.5/1.5) to get the -45 ?
     
  2. jcsd
  3. Apr 14, 2015 #2

    mfb

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    Staff: Mentor

    The vector does not need a reference point, just a reference direction. Relative to the x-axis should be fine. Or relative to some other direction which you clearly describe. Like "from the center towards the new position of [...]".
    The magnitude should be positive.
     
  4. Apr 15, 2015 #3
    So could I say the raft moves 2.12 meters in a direction of 135 degrees when viewing form above?
     
  5. Apr 15, 2015 #4

    mfb

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    Staff: Mentor

    If you clarify 135 degrees relative to what, sure.
     
  6. Apr 15, 2015 #5
    relative to the point of origin (bottom left corner)... looking at it from above it would move into the the third quadrant , of course the raft would stay square to the x and y axis
     
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