A plate of area 100cm^(2) is placed on the upper surface of castor oil 2 mm thick. Taking the coefficient of viscosity to be 15.5 poise, calculate the horizontal force necessary to move the plate with a velocity of 3 cm/s?

A plate of area 100cm^(2) is placed on the upper surface of castor oil

1.	A plate of area 100cm^(2) is placed on the upper surface of castor oil 2 mm thick. Taking the coefficient of viscosity to be 15.5 poise, calculate the horizontal force necessary to move the plate with a velocity of 3 cm/s?
Answer» SOLUTION :From `F=-eta A(dV)/(dx)` `F=-15.5xx100xx(-3)/0.2` `=232.5xx10^(2)` dyne `=232.5xx10^(-3)N`