Current Attempt in Progress

Oil $)=(0\mathrm{.}80,$ with a kinematic viscosity of $0\mathrm{.}007f\frac{t^2}{s},$ flows in a $3-$in$.-$diameter pipe at $0\mathrm{.}75f\frac{t^3}{s}.$ Determine the head loss per unit length of this flow.

$h_L=$

$$ ft per ft of pipe