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Q. |
A man standing close to the platform at a railway station experiences a pulling force towards a fast moving train because of |
A. | gravitational force between train and man. |
B. | illusion of the man |
C. | the centripetal force |
D. | pressure difference due to fast moving air in between |
Answer» D. pressure difference due to fast moving air in between | |
Explanation: When a fast-moving train passes a man standing on the platform at rest, the air between train and person also moves with greater speed. This rapidly moving air, by Bernoulli's principle will have a lower pressure than the still air a few feet away. The still air, having higher pressure, and being behind the man standing close will tend to push him toward the train. |
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