A metal plate 5 cm xx 5 cm rests on a layer of castor oil 1 mm thick whose coefficient of viscosity is 1.55 Nsm^(-2) . Find the horizontal foce required to move the plate with a speed of 2 cm/s

A metal plate 5 cm xx 5 cm rests on a layer of castor oil 1 mm thick w

1.	A metal plate 5 cm xx 5 cm rests on a layer of castor oil 1 mm thick whose coefficient of viscosity is 1.55 Nsm^(-2) . Find the horizontal foce required to move the plate with a speed of 2 cm/s
Answer» Solution :`"" ` Area = ` A = 25 cm ^(2)= 25 XX 10 ^(-4)m^(2)` `"" ` THICKNESS = ` dx = 1 mm = 10^(-3)m ` COEFFICIENT of velocity ` = eta = 1.55 Ns m^(-2)` ` "" ` Force= ? ` "" dv = 2 xx 10 ^(-2)m//s` ` "" F = eta( ADV)/( dx)` ` "" = 1.55 xx 25 xx 10 ^(-4) xx ( 2xx10 ^(-2))/( 1 xx 10 ^(-3))` ` = 0.0775 ` N