First slide

Viscosity

Question

A layer of glycerine of thickness 1 mm is present between a large surface area and a surface area of 0.1 m². With what force the small surface is to be pulled, so that it can move with a velocity of 1 m/s? (Given that coefficient of viscosity= 0.07 kg-m^-1 s^-1)

Easy

A

70 N
B

7 N
C

700 N
D

0.70 N

Solution

$F = ηA \frac{∆ x}{∆ y} = 0.07 \times \frac{0.1 \times 1}{10^{- 3}} = 7 N$

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