Final answer:
The question does not require physics calculations but pertains to safety equipment on boats. However, the reference information indicates an exercise in fluid mechanics, where fluid speed and flow rate through a hose are calculated using physics principles.
Step-by-step explanation:
The question is concerning the required fire fighting equipment for boats that are 9 meters to 12 meters in length. This is typically a safety regulation matter, which may be mentioned in physics when discussing fluid dynamics in the context of fire hoses, but does not directly require a physics calculation for solving. Thus, to address the student's query directly, no explicit physics calculations are required to determine the equipment needed on boats of this size.
The reference information provided, which includes calculations for the flow rate and fluid speed in a fire hose, seems to be related to an exercise in fluid dynamics—a topic within physics. This exercise would require an understanding of formulas used in fluid mechanics to calculate the velocity of the water and flow rate through the hose.
If we were to answer the reference question: the fluid speed in a fire hose with a 9.00-cm diameter carrying 80.0 liters of water per second when converted to cubic meters per second would require the use of the continuity equation and unit conversions. Additionally, if salt water was used in place of fresh water, the fluid speed would remain the same, as the flow rate is determined by volume per time; however, the characteristics of the fluid, like density and hence its mass flow rate, could change.