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Modulus of speed

  1. Mar 13, 2007 #1
    1. The problem statement, all variables and given/known data
    i just want to know what the modulus of the speed (u) would if


    2. Relevant equations
    u = (-2/r)er + (2/r)etheta

    The thing is i get confused with the er and etheta ..do these just mean the direction...this topic is fluid mechanics

    3. The attempt at a solution
    i reckon the answer is square root 8/r ...as i reckon the e's dont get affect...can some one verify this
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 13, 2007 #2
    The e_r and e_theta are directions in plane polar coordinates.
     
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