Equation of flow rate

  • Thread starter foo9008
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  • #1
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Homework Statement


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 ?
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Homework Equations




The Attempt at a Solution

 

Answers and Replies

  • #2
BvU
Science Advisor
Homework Helper
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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
 
  • #3
678
4
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
thanks , i got the ans already
 

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