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Homework Help: Equation of flow rate

  1. Apr 12, 2016 #1
    1. The problem statement, all variables and given/known data
    the equation of flow aret given is [(pi)((r_o)^4 ) / 8μ ] [-d/ds (ρ +yz ) ] , but the ans that i got is - [(pi)((r_o)^4 ) / 8μ ] [-d/ds (ρ +yz ) ] , what's wrong with my working ?
    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Apr 12, 2016 #2


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    Try the simpler $$\int_0^{r_0} (r_0^2 -r^2)\, r dr $$to avoid things like the ##r_0^3## (?) in your first step
  4. Apr 12, 2016 #3
    thanks , i got the ans already
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