Water flows steadily through the $1\mathrm{.}2$ cm diameter galvanized iron pipe system shown at a rate of $0\mathrm{.}01\frac{m^3}{s}.$ your boss suggests that friction losses in the straight pipe sections are negligible compared to losses in the threaded elbows and fittings of the system. Reducer loss coefficient is $0\mathrm{.}15,$ kinematic viscosity of water is $1\mathrm{.}72{10}^{-5}\frac{m^2}{s}.$

Do you agree or disagree with your boss? Support your answer with appropriate calculations.