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Question

A curtain is hanging at the entrance of a room. A long corridor runs at right angles to the door, that is parallel to the curtain. If a strong wind blows along the corridor, the curtain will


A

Get pushed inside the room

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B

Get pushed outside the room

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C

Get collected towards one end/swirled

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D

Remain unaffected

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Solution

The correct option is B

Get pushed outside the room


  1. According to the basic crux of Bernoulli's theorem, the higher the velocity, the lower the pressure, and vice versa.
  2. Pressure1velocity
  3. The interaction of the high-velocity air (v1) coming from the corridor with the outer face of the curtain creates a low-pressure zone (p1) near the outer face of the curtain as depicted by the diagram shown above.
  4. p11v1high-velocity air will create a low-pressure zone.
  5. The interaction of the low-velocity air (v2) coming from the room with the inner face of the curtain creates a high-pressure zone (p2) near the inner face of the curtain as depicted by the above diagram.
  6. p21v2low-velocity air will create a high-pressure zone.
  7. The pressure on the inner face of the curtain (p1) is greater than the pressure on the outer face of the curtain (p2) and consequently, the curtain will get pushed outside the room.

Hence, option B is correct.


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