problem $5.$ The rectangular deck of a railroad bridge $-$ buil on a $50-0$ out wide water channel $-$ sits on a $25-$foot$-$tall smooth cylindrical pier, as shown in the are expottom of the pier, caused by drag forces. the drag coefficient of the bridge deck is

is $1\mathrm{.}61{10}^{-4}f\frac{t^2}{s},$ and air density is $2\mathrm{.}34{10}^{-3}$ equal to $1.$ Air kinematic viscosity