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Pressure of an ideal gas

  1. Dec 7, 2014 #1
    can someone help me .In this video from 2.00 to 3.00 how the velocity vector drawn with red color can be broken into x-y-z components and why after bouncing back only x component of velocity changed and y ,z components remained same?
     
  2. jcsd
  3. Dec 7, 2014 #2
    It's bouncing off a y-z plane. Just bounce a ball off a vertical wall, and see which components reverse and which components remain the same. Only the component normal to the plane reverses.

    Chet
     
  4. Dec 7, 2014 #3
    how the velocity vector drawn with red color can be broken into x-y-z components ?
    how you came to know that?
     
  5. Dec 7, 2014 #4
    You can always resolve a vector into components.

    You can see in the figure that the wall that it bounces off is parallel to the y-z plane.

    Chet
     
  6. Dec 7, 2014 #5
    i know how to resolve vectors but only in 2 dimensions.
     
  7. Dec 7, 2014 #6
    Well, it can be done in 3 dimensions too.

    Chet
     
  8. Dec 7, 2014 #7
    can all vectors be resolved in 3 dimensions?
     
  9. Dec 7, 2014 #8
    Yes. In 3D space, all vectors can be resolved into combinations of 3 linearly independent components.

    Chet
     
  10. Dec 7, 2014 #9
    but only vectors which are in 3d ,for example this kind of vector (in the image below) can only be resolved in 2d i.e only with two perpendicular component.right?
    images?q=tbn:ANd9GcSKd7xZd5V-4P4sk36mIENHU_m4sYE0QL5Pm8pa6md9cAnq5Z6j.jpg
     
  11. Dec 7, 2014 #10
    All that means is that the component out of the paper is zero.

    Chet
     
  12. Dec 7, 2014 #11
    ok if any vector is coming out of page ,what it's x component would be?i can only imagine it in y z plane.
     
  13. Dec 7, 2014 #12
    If the vector is through the origin, then you drop a normal from its tip to each of the three coordinate axes to get its x, y, and z components.

    Chet
     
  14. Dec 7, 2014 #13
    From Tip of vector which has to be resolved?
     
  15. Dec 7, 2014 #14
    Yes.
     
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