Question

An air bubble of radius 10^-2 m is rising up at a steady rate2×103

Answer 1

An air bubble of 1cm radius is rising at a steady rate of 2

through a liquid of
density 1.5
3
neglect density of air, if g is 1000

2
, then the coefficient of
viscosity of the liquid is ?
Force of viscosity equals (Stokes' law):
= 6
where – speed of the bubble, - coefficient of viscosity
Buoyant force that is exerted on bubble equals:
= =
4
3

3
Newton’s first law of motion:
=
6 =
4
3

3
=

4
3

3
6
=
2
2
9
≅ 167

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