Question 305: Properties of Matter

Question

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. (Co-efficient of viscosity of water is 10
$$-$$2
Pa.s)

Accepted Answer

$$F =  - \eta A{{du} \over {dx}}$$
$$ \Rightarrow {10^{ - 3}} = {10^{ - 2}} 	imes {{10} \over h}$$
$$ \Rightarrow h = {{{{10}^{ - 1}}} \over {{{10}^{ - 3}}}}$$ m = 100 m
$$\Rightarrow$$ (100)

Properties of Matter

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. (Co-efficient of viscosity of water is 10 -$2 Pa.s)

Integer / Numeric Answer Type