question_answer

The velocity of water in a river is 18 km/h near the surface. If the river is 5 m deep, find the shearing stress between the horizontal layers of water. The co-efficient of viscosity of water \[={{10}^{-2}}\] poise.       [JEE ONLINE 19-04-2014]

A)  \[{{10}^{-1}}N/{{m}^{2}}\] 

B)       \[{{10}^{-2}}N/{{m}^{2}}\]

C)  \[{{10}^{-3}}N/{{m}^{2}}\]  D)       \[{{10}^{-4}}N/{{m}^{2}}\] Correct Answer: B Solution : [b]  poise

Strain rate

Coefficient of viscosity,

shearing stress strain rate