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  • There is a thick layer of glycerine between a flat plate of area <img alt="100 \mathrm{~c

There is a 1 \mathrm{~mm} thick layer of glycerine between a flat plate of area 100 \mathrm{~cm}^2\, \, \& a big fixed plate. If the coefficient of viscosity of glycerine is 1.0 \mathrm{~kg} / \mathrm{m}-s then how much force is required to move the plate with a velocity of 7 \mathrm{~cm} / \mathrm{s} ?

Option: 1

3.5 N


Option: 2

0.7 N


Option: 3

1.4 N


Option: 4

None


Answers (1)

best_answer

\mathrm{\begin{aligned} F & =\eta A \frac{d v}{d x} \\ & =1 \times 100 \times 10^{-4} \times \frac{7 \times 10^{-2}}{1 \times 10^{-3}} \\ F & =0.7 \mathrm{~N} \end{aligned}}

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SANGALDEEP SINGH

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