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Question

Water flows at a speed of 6cms1 through a tube of radius 1 cm. Coefficient of viscosity of water at room temperature is 0.01 poise. Calculate the Reynolds number . Is it a steady flow ?


Solution

 v = 6 cm/s =6×102m/sec

 r = 1 cm = 10^{-2} m \)

D = 2×102m

 η=0.01poise

 v = RnpD

R=vρDη

 = (6×103)×103×(2×102)102

 = 120                             [because , rhowater=103kg/m3]

If 0 < R < 2000 then it will be steady flow.

Here, 0 < 120 < 2000

So, it is a  steady flow.


Physics

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