$2\mathrm{.}2$ Water at $15C$ flows through a $100mm\frac{O}{?}$ pipeline at a rate of $50k\frac{g}{s}.$

$2\mathrm{.}2\mathrm{.}1$ Determine whether the flow in the pipeline is turbulent or laminar.

$2\mathrm{.}2\mathrm{.}2$ If the absolute roughness of the pipe material is $0\mathrm{.}3mm,$ and the friction

coefficient for the pipe can be taken as being independent of the viscosity of the

water, calculate the loss of energy due to friction per kilometre length of pipe.