A large stabilizing fin projects from the keel on the hull of an ocean liner, which is traveling at a speed of $30$ knots. Assuming that the fin can be considered as a smooth flat plate, determine the following elements of the boundary layer at a distance of $3$ m from the leading edge of the fin: $($a$)$ thickness $\backslash$delta $\text{'}$ of the laminar sublayer, $($b$)$ velocity $$ for y $=\backslash$delta $\text{'},($c $)$ velocity $$ for y$/\backslash$delta $=0\mathrm{.}15,($d$)$ the distance y for y$/\backslash$delta $=0\mathrm{.}15$ and the thickness $\backslash$delta $.$ Compare your results with those obtained for the airplane wing model.