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J & K CET Engineering J and K - CET Engineering Solved Paper-2011

  • question_answer
    An aeroplane of mass \[3\times {{10}^{4}}\,kg\] and total wing area of \[120\text{ }{{m}^{2}}\]is in a level flight at some height. The difference in pressure between the upper and lower surface of its wings in kpa is \[g=20m/{{s}^{2}}\])

    A)  \[2.5\]  

    B)  \[5\]

    C)  \[10\]     

    D)  \[15\]

    Correct Answer: A

    Solution :

    Pressure, \[\Delta p=\frac{F}{A}\] \[=\frac{mg}{A}\] \[=\frac{3\times {{10}^{4}}\times 10}{120}\] \[={{10}^{3}}\times 2.5\] \[=2.5kPa\]


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