Class 11 Physics Mechanics Mechanical Properties of Fluids
A plate of metal 100 cm in area rests on a layer of castor oil 2mm thick, whose coefficient of viscosity is 15.5 poise. The horizontal force required to move the plate with a uniform speed of is:
(a)
28,250 dyne
(b)
23,250 Newton
(c)
23,250 dyne
(d)
28,250 Newton
Correct answer: (c) 
Solution: Force =

Now,

So, force=

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mechanical properties of fluids
friction
laws of motion
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