Class 11 Physics Mechanics Mechanical Properties of Fluids

Now the force exerted by the liquid on the plate is:

(a)

0.6 N

(b)

0.4/3 N

(c)

1.6/3N

(d)

None

Correct answer: (a)

Solution:

There will be
backward viscous force acting on both the sides, first from liquid
above the plate, and second from liquid below the plate. In this case
$dx$ for one side liquid is 2 cm and for another side liquid,
$dx$ is 4cm. so we
have

A\dfrac{dv}{dx}\right)_1+\left(\mu
A\dfrac{dv}{dx}\right)_2 \\\Rightarrow

F_v= 0.8 \times 0.01 \times
\dfrac{1}{0.02} +0.8 \times 0.01 \times

\dfrac{1}{0.04}= 0.6N

Similar topics

mechanical properties of fluids

friction

laws of motion

circular motio

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