There is 1 mm thick layer of glycerine between flat plate of area 100 cm² and big plate .If cofficient of viscosity of glycerine is 1 kg/ m sec then how much required to move the plate with a viscosity of 7 cm/ sec.
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The required force is 0.7 N
Explanation:
F = η A Δv / Δx
F = 1 x (100 x 1 x 10^-4 ) x 7 x 10^-2 / 1 x 10^-3
F = 7 x 100 x 10^-6 / 10^-3
F = 7 x 10^-4 x 10^3
F = 7 x 10^-1
F = 0.7 N
Thus the required force is 0.7 N
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