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MGIMS WARDHA MGIMS WARDHA Solved Paper-2003

  • question_answer
    n balls each of mass m and velocity \[\upsilon \] collide with a wall, assume that the  collisions are perfectly elastic. The a pressure exerted per second on the well is:

    A) 3 \[mn\upsilon \]                            

    B) \[mn\upsilon \]         

    C) \[2mn\upsilon \]                             

    D) none  

    Correct Answer: C

    Solution :

    Pressure = change in momentum change in momentum for a ball \[=m\upsilon -(-m\upsilon )=2m\upsilon \] Therefore, for n balls change in momentum \[=2mn\upsilon \]       


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