A $25-$mm$-$diamter shaft is pulled through a cylindrical bearing as shown in figure below. The lubricant that fills the gap between the shaft and bearing is an oil having a kinematic viscocity of $8\mathrm{.}5*10^(-4)$ m$^2/$s and a specific gravity of $0\mathrm{.}95.$ If the force P$,$ required to pull the shaft at a velocity of $3$ m$/$s is $10$N$,$ determine the height of the gap between the bearing and shaft.