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11th Class Physics Mechanical Properties of Fluids / तरलों के यांत्रिक गुण Question Bank Mechanical Properties of Fluids Conceptual Problems

  • question_answer
    If air is blown very fast into the vertical hole of a spool of thread, a card laid flat against the other end does not fall. Why?

    Answer:

                    Refer to Fig. Due to large velocity of air between the spool and the card, the pressure between them reduces below the atmospheric pressure. The card is held by the higher atmospheric pressure below it.


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