Q$3.(10$entes$)$ Solve the following questions:

A$.$ Oil with an absolute viscosity of $0\mathrm{.}15N.\frac{5}{m^2}$ and a density of $935k\frac{g}{m^3}$ is flowing in a $180mm$

diameter pipe at a $0\mathrm{.}5\frac{L}{s}$ flow rate.

The headloss per $300$ meter of pipe length is

The length of entrance for the fully developed flow to start is$....$