Firefighter Mechanical Aptitude · Question
Two gears, Gear A with 20 teeth and Gear B with 40 teeth, are meshed. If Gear A rotates at 100 RPM (revolutions per minute), what is the RPM of Gear B?
The gear ratio is inversely proportional to the number of teeth. If Gear B has twice as many teeth as Gear A (40/20 = 2), it will rotate at half the speed. Ther
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Question: Two gears, Gear A with 20 teeth and Gear B with 40 teeth, are meshed. If Gear A rotates at 100 RPM (revolutions per minute), what is the RPM of Gear B?
Answer options: ✅ 50 RPM
- 100 RPM
- 200 RPM
- 400 RPM
Correct answer: 50 RPM
Explanation: The gear ratio is inversely proportional to the number of teeth. If Gear B has twice as many teeth as Gear A (40/20 = 2), it will rotate at half the speed. Therefore, 100 RPM / 2 = 50 RPM.
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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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