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Q.

consider a thin square plate floating on a viscous liquid in a large thank. The height h of the liquid in the tank is much less than the width of the tank. The floating plate is pulled horizontally with a constant velocity u0 . Which of the following statements is (are) true?

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a

The tangential (shear) stress on the floor of the tank increases with  u0.

b

The tangential (shear) stress on the plate varies linearly with the viscosity η  of the liquid.

c

The resistive force of liquid on the plate is inversely proportional to h

d

The resistive force of liquid on the plate is independent of the area of the plate

answer is A, C, D.

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