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Q.

A metal plate of area 2 m2 is pulled horizontally with a velocity of 0.5 ms-1 on a liquid layer 1 mm thick. The force required, if the viscosity of liquid is 12 N s m-2 is

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a

1.2 N

b

12 N

c

12000 N

d

1200 N

answer is C.

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Detailed Solution

F = ηAvy = 12×2×0.51×10-3N = 12000 N
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