Problem $3.$

Liquid ammonia at $-20C$ is flowing through a $20m$ long section of a $5mm$ diameter copper tube at a rate of $0\mathrm{.}09k\frac{g}{s}.$ Determine the pressure drop and the head loss in the pipe. The density and dynamic viscosity of liquid ammonia are $665\mathrm{.}1k\frac{g}{m^3}$ and $=2\mathrm{.}361{10}^{-4}k\frac{g}{m}*s.$