Firefighter Mechanical Aptitude · Question
A firefighter expends 500 N-m of energy to drag a heavy object across a floor. If only 400 N-m of that energy is used to actually move the object (overcoming friction and inertia), what is the efficiency of this process?
Efficiency is calculated as (Work Output / Work Input) × 100%. In this case, (400 N-m / 500 N-m) × 100% = 80%.
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Question: A firefighter expends 500 N-m of energy to drag a heavy object across a floor. If only 400 N-m of that energy is used to actually move the object (overcoming friction and inertia), what is the efficiency of this process?
Answer options:
- 20%
- 50% ✅ 80%
- 125%
Correct answer: 80%
Explanation: Efficiency is calculated as (Work Output / Work Input) × 100%. In this case, (400 N-m / 500 N-m) × 100% = 80%.
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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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