Firefighter Mechanical Aptitude · Question
A firefighter uses a hose to apply water to a fire. What happens to the pressure of the water as it moves from a wider hose section to a narrower nozzle?
According to the principle of continuity and Bernoulli's principle, as the area of the flow path decreases (narrower nozzle), the fluid velocity increases, and
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Question: A firefighter uses a hose to apply water to a fire. What happens to the pressure of the water as it moves from a wider hose section to a narrower nozzle?
Answer options:
- Pressure increases, and speed decreases. ✅ Pressure decreases, and speed increases.
- Both pressure and speed remain constant.
- Both pressure and speed decrease.
Correct answer: Pressure decreases, and speed increases.
Explanation: According to the principle of continuity and Bernoulli's principle, as the area of the flow path decreases (narrower nozzle), the fluid velocity increases, and consequently, the static pressure decreases.
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Question explanations
- Scenario 1: Which simple machine uses a fulcrum to multiply force or change the direction of force?
- Scenario 2: If a hydraulic jack has a small piston with an area of 5 cm² and a large piston with an area of 50
- Scenario 3: Which of the following would require the MOST force to move?
- Scenario 4: A rope is tied to a heavy box. Instead of pulling the box directly, a firefighter wraps the rope a
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