Why should you not stand close to a fast-moving train?
Correct answer: C. The fast-moving train creates a strong air pressure which can cause you to fall and hurt yourself
- A. The impact from any object falling out of the train can be extremely injurious due to the velocity of the train
- B. The fast movement in front of your eyes will make you feel dizzy and cause you to faint
- C. The fast-moving train creates a strong air pressure which can cause you to fall and hurt yourself
- D. It's just a disciplinary measure, there is no harm in standing close to a fast-moving train
Explanation
When a fast-moving train passes on a rail, the velocity of the air stream in between the rail and the by-stander standing near the rail is larger compared to the velocity of air streams on the other side of the by-stander away from the rail. According to Bernoulli's theorem, the pressure of air will become low between person and rail and is high on the other side of the by-stander. As a result of this pressure difference, a thrust acts on them, pushing them towards the rail side leading to possible accidents.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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