Firefighter Mechanical Aptitude · Question
When a fire hose expands due to increased water pressure, what happens to the velocity of the water flowing through the hose, assuming the flow rate remains constant?
If the hose diameter increases (expands) and the volumetric flow rate (Q) remains constant, then according to the continuity equation (Q = A * v), where A is ar
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Question: When a fire hose expands due to increased water pressure, what happens to the velocity of the water flowing through the hose, assuming the flow rate remains constant?
Answer options:
- It increases ✅ It decreases
- It remains the same
- It fluctuates rapidly
Correct answer: It decreases
Explanation: If the hose diameter increases (expands) and the volumetric flow rate (Q) remains constant, then according to the continuity equation (Q = A * v), where A is area and v is velocity, the velocity must decrease.
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- 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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