The high-speed airflow between the cars causes the air pressure in that space to drop. The air pressure on the outer sides of the cars, which is still at the ambient atmospheric pressure, is now higher than the pressure between the cars. This pressure difference creates a net force pushing the cars inwards towards each other, making them prone to side swiping.
Two cars, passing each other at high speed, are in danger of side swiping because
Asked in WBPSC CS Prelims 2019 · Topic: Mechanics (Fluid Statics and Dynamics (Continuity Equation, Bernoulli's Theorem))
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Answer: C. of decrease in air pressure in the space between them.
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