A flat area 1.5 m^2 is pulled with a speed of 0.4 m/s relative to the another plate loacated at a distance of 0.15 mm from it . Find the force required to maintain the speed . If the fluid separating them is having viscocity as 1 poise.
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Answer:
Force required = ηA
dy
dv
Now,
dy
dv
=
1cm
10×1cm/s
=10/s
So, force to keep plate moving = 10×10×20 dyne = 2000 dyne
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