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AMU Medical AMU Solved Paper-2010

  • question_answer
    Choose the correct statement(s) for a cricket ball that is spinning clockwise through air S1 : Streamlines of air are symmetric around the ball. S2: The velocity of air above the ball relative to it is larger than that below the ball. 53 : The velocity of air above the ball relative to it is smaller than that below the ball. S4 : There is a net upward force on the ball.

    A)  S1, S2 and S4      

    B)  S2 and S4

    C)  S4 only                                

    D)  S3 only

    Correct Answer: B

    Solution :

                     The resultant velocity of air above the ball will be \[(v+r\omega )\] and below it \[(v-r\omega )\]. So, in accordance with Bernoullis principle pressure above the ball will be less than below it. Due to this difference of pressure an upward force will act on the ball.


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