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Q.

The velocity of upper layer of water in a river is 36kmph. Shearing stress between horizontal layers of water is 10−3N/m2 depth of the river is (Coefficient of viscosity of water is 10−2Pa.s)

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a

100m

b

90m

c

95m

d

120m

answer is C.

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Detailed Solution

FA=ηdVdx V2=36×518=10m/s

=ηV2−V1h

10−3=10−210−0h

110=10h

h=100m

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