First slide

Viscosity

Question

Coefficient of viscosity of water =0.01 poise, density of water = 1 g ${cm}^{- 3}$ . Then the maximum velocity with which water can flow through a capillary tube of radius 0.05 cm, without turbulent flow setting in, is

Moderate

A

2 $cm s^{- 1}$
B

20 $cm s^{- 1}$
C

200 $cm s^{- 1}$
D

2000 $cm s^{- 1}$

Solution

$v_{c} = \frac{2000 \times 0.01}{1 \times 2 \times 0.05}$ $cm s^{- 1}$ = 200 $cm s^{- 1}$

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