Properties Of Solids And Liquids Question 243
Question: A square plate of 0.1 m side moves parallel to a second plate with a velocity of O. 1 m/s, both plates being immersed in water. If the viscous force is 0.002 N and the coefficient of viscosity is 0.01 poise, distance between the plates in m is
Options:
A) 0.1
B) 0.05
C) 0.005
D) 0.0005
Show Answer
Answer:
Correct Answer: D
Solution:
[d] $ A={{(0.1)}^{2}}=0.01m^{2},\eta =0.01 $
poise = 0.001 decapoise (M.K.S. unit), $ dv=0.1m/s $
and $ F=0.002N $
$ F=\eta A\frac{dv}{dx} $
$ \therefore dx=\frac{\eta Adv}{F}=\frac{0.001\times 0.01\times 0.1}{0.002}=0.0005m $
