Q.

When a tangential force of 0.02 N is applied on a large wooden plate of area 10 m2 floating on the surface of river, plate moves with the speed 2 m/s on the river surface. The river is 1 m deep and the water in contact with the bed is stationary. Assuming constant speed gradient, coefficient of viscosity of water is

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a

10−5 poise

b

10−2 poise

c

10−9 poise

d

10−15 poise

answer is B.

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Detailed Solution

n=FAdvdx=0.021021=10−3kg/ms=10−2 poise
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When a tangential force of 0.02 N is applied on a large wooden plate of area 10 m2 floating on the surface of river, plate moves with the speed 2 m/s on the river surface. The river is 1 m deep and the water in contact with the bed is stationary. Assuming constant speed gradient, coefficient of viscosity of water is