High School

The flow rate for a particular fire hose can be found using [tex]f = 120 \sqrt{p}[/tex], where [tex]f[/tex] is the flow rate in gallons per minute and [tex]p[/tex] is the nozzle pressure in pounds per square inch.

When the nozzle pressure is 169 pounds per square inch, what is the flow rate?

Answer :

Sure! Let's solve the problem step by step.

The formula provided to find the flow rate [tex]\( f \)[/tex] is:

[tex]\[ f = 120 \sqrt{p} \][/tex]

where:
- [tex]\( f \)[/tex] is the flow rate in gallons per minute.
- [tex]\( p \)[/tex] is the nozzle pressure in pounds per square inch.

We are given that the nozzle pressure [tex]\( p \)[/tex] is 169 pounds per square inch. We need to find the flow rate [tex]\( f \)[/tex].

Step-by-Step Solution:

1. Identify the given value:
- Nozzle pressure, [tex]\( p = 169 \)[/tex] pounds per square inch.

2. Substitute the given value into the formula:
[tex]\[ f = 120 \sqrt{169} \][/tex]

3. Calculate the square root of 169:
[tex]\[ \sqrt{169} = 13 \][/tex]

4. Multiply 120 by the square root of 169:
[tex]\[ f = 120 \times 13 \][/tex]

5. Perform the multiplication:
[tex]\[ f = 1560 \][/tex]

So, the flow rate [tex]\( f \)[/tex] when the nozzle pressure is 169 pounds per square inch is:

[tex]\[ \boxed{1560 \text{ gallons per minute}} \][/tex]