A bullet train is lifted above the rails due to magnetic effect, thus friction is reduced to minimum and speed can be enhanced up to:
Correct answer: D. 500 Km h-1
- A. 500 Km min-1
- B. 500 Km sec-1
- C. 1000 Km h-1
- D. 500 Km h-1
Explanation
Explanation:The lifting of a bullet train above the rails due to magnetic fields reduces friction, allowing the train to reach higher speeds. However, the maximum speed achievable by a magnetic levitation train is currently around 500 Kmh-1
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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About Fluid Drag
Fluid drag is the resistive force exerted by a liquid or gas on an object moving through it, and its value depends on speed, fluid density, shape and exposed area. Questions examine drag at low and high speeds, terminal velocity when drag balances weight, and the difference between drag and ordinary solid friction.
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