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Q.

The velocity of upper layer of water in a river is 36 kmh-1. Shearing stress between horizontal layers of water is 10-3 Nm-2. Depth of the river is _______ m. (Coefficient of viscosity of water is 10-2 Pa.s).

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answer is 100.

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Detailed Solution

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F = ηA∆vx∆y

FA =η∆vx∆y

⇒10-3 = 10-2 x36 x 1000h x 3600

⇒h= 10-2 x 36 x 100010-3 x 3600 = 100 m

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