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Homework Help: Shear stress formula

  1. Mar 8, 2016 #1
    how to get the formula of shear stress (tau) ? i got (-dp/ds -ydz/ds )(r/2) instead of -d(p+yz)/ ds (r/2) as in the book , if it's d(p+yz)/ ds (r/2) m , i would get (-dp/ds -ydz/ds-z(dy/ds) )(r/2) ,, right ?




    3. The attempt at a solution
    P/s : i'm concerned about the derivation part , so i didnt upload the complete version of the note
     

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  2. jcsd
  3. Mar 8, 2016 #2
    Is the book wrong?
     
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