Final answer:
The question pertains to the optimal length of a 1 3/4" fire hose for upper floor fires, relating to firefighting tactics. It indirectly invokes fluid dynamics concepts such as Reynolds number for understanding hose capability, though no specific length limit is provided in the excerpts.
Step-by-step explanation:
The question about the recommended limit to the length of a 1 3/4" hose that should be deployed on upper floor fires primarily deals with firefighting tactics and equipment rather than a specific calculation or physical concept. However, providing a clear answer will require an understanding of fluid dynamics to ensure firefighters can effectively combat fires at various heights while also considering the limitations of firefighting equipment such as hoses and pumps.
The Reynolds number is a dimensionless quantity used in fluid mechanics to predict flow patterns in different fluid flow situations. A high Reynolds number usually indicates turbulent flow which is a factor to consider when deploying fire hoses. The question provided, however, is not directly related to any of the excerpts since it is about the practical use of a fire hose rather than a calculation of pressure or fluid dynamics.
Although the example given calculates the pressure in a fire hose nozzle and the flow being turbulent, the original question is more about operational limits on equipment rather than the fluid dynamics within the equipment. Hence, a specific length limit for a 1 3/4" fire hose deployment on upper floors is not provided in the excerpts given.