Question

A square plate of side 20 cm moves parallel to another plate with a velocity of 30cms -1 . Both plates are immersed in water. If the viscous force is 200 dyne and viscosity of water is 0.02poise then, what is the distance between them?​

Answer 1

Answer:

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Class 11

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>>A square plate 0.1 m side moves parallel

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A square plate 0.1 m side moves parallel to second plate with a velocity of 0.1 ms

−1

, both plates being immersed in water. If the viscous force is 0.002 N and the coefficient of viscosity 0.001 poise, distance between the plates is

Easy

Solution

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Correct option is D)

Given data,

Area=a

2

=1×0.1=0.1m

2

η=0.01poise

η=

10

0.01

=0.001deca poise

dv=0.1m/s

F=0.002N

We know that

As F=ηA

dx

dv

or dx=η

F

Adv

=

0.002

0.001×(0.1)

2

×0.1

=0.0005m

Explanation:

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