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A Faxen's 2nd law

  1. Oct 23, 2016 #1
    Can someone show me how Faxen's 2nd law for the viscous torque on a rotating sphere comes to be?

    I know tau_(r phi) = -3 mu Omega sin(theta)

    Torque is integral of vec(r) cross vec(f)

    But I can't get the right answer so I am doing something very wrong

  2. jcsd
  3. Oct 25, 2016 #2


    Staff: Mentor

    This talk may help explain it better:

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