How long does a 10 lb fire extinguisher last when the spray is constant?
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Answer

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Step 1:
I'll solve this problem step by step, following the specified LaTeX formatting guidelines:

Step 2:
: Identify the Given Information

- Weight of fire extinguisher: $$10 \text{ lb}
- Discharge rate is not explicitly stated, so we'll need to use a standard discharge rate

Step 3:
: Research Standard Discharge Rates

- Typical fire extinguishers discharge at approximately $$0.5 \text{ lb/second}

Step 4:
: Calculate Discharge Time

- $$\text{Discharge Time} = \frac{10 \text{ lb}}{0.5 \text{ lb/second}}
- Total time = Total weight ÷ Discharge rate

Step 5:
: Perform Calculation

- $$\text{Discharge Time} = 20 \text{ seconds}

Step 6:
: Verify Calculation

- $$20 \text{ seconds} \times 0.5 \text{ lb/second} = 10 \text{ lb} \checkmark

Final Answer

Note: Actual discharge time may vary slightly depending on specific extinguisher model and discharge conditions.