Q$.3$ : A rectangular plate, $0\mathrm{.}50$ m wide and $1$ m long and

weighing $50$ N $,$ is kept on an inclined plane sloping at $45.$

The space of $2$ mm between the plate and the plane is filled

with an oil of viscosity $1\mathrm{.}0$ Pas. What force will be required to

pull the plate up on the plane at a constant velocity of

$0\mathrm{.}50\frac{m}{s}?$

$($Ans$.$ : $F=160\mathrm{.}35N)$