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Rotating sprinkler head and torque

  1. Sep 9, 2015 #1
    Hi, can anyone tell me where this "shaft torque" is coming? What is causing this torque?
    Screenshot is from Fundamentals of Fluid Mechanics by Munsun.
    http://postimg.org/image/3zilpmzbv/
    Thank you.
     
  2. jcsd
  3. Sep 9, 2015 #2
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