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What should be the average velocity of water in a tube of diameter `0.4 cm` so that the flow is (i) laminar (ii)turbulent ? The viscosity of water is `10^(-3) Nm^(-2) s`.

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For laminar flow, Reyond's number, `N_(R)=2000` and for turbulent flow, `N_(R)=3000`.
Using, `v_(c)=(N_(R) eta)/(rho D)`, calculate `v_(c)` for the two cases.
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