vector cylindrical

Discussion in 'Math' started by TimeZero, Oct 9, 2015.

  1. TimeZero

    Thread Starter New Member

    Sep 14, 2015
    18
    0
    hi
    I watched this video , I have question why he is change the the angle 90 degree for what?

    vector cylindrical


    Capture.PNG

    at 4.43
     
  2. sailorjoe

    Member

    Jun 4, 2013
    361
    63
    good question. Think about the direction tha phi (the angle) travels as it increases. It continually points in the direction of rotation. It always points tangentially to the circle that phi sweeps as it increases from zero to 2*pi radians.
    This is similar to the zed unit vector, which also points in the same direction that zed increases as it goes from zero to infinity.
    Hope that helps.
     
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