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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2015

  • question_answer
    A ball is projected vertically upwards with a certain initial speed. Another ball of the same mass is projected at an angle of 60 with the vertical with the same initial speed. At highest point of the journey, the ratio of their potential energies will be

    A) 2:1                                         

    B) 3:2

    C) 4:-1                                       

    D) 1 :1

    Correct Answer: C

    Solution :

    For first ball, \[\Delta n=6-\frac{15}{2}=-\frac{3}{2}\] \[\because \] For second ball \[\Delta H=\Delta U+RT.\Delta n\] \[\therefore \] \[-3268=\Delta U+8.314\times {{10}^{-13}}\times 293\times \left( \frac{-3}{2} \right)\] \[\therefore \] \[\Delta U=-3268+\frac{3}{2}\times 8.314\times {{10}^{-13}}\times 298\] \[=-3268++3.716=-3264\,KJ\,mo{{l}^{-1}}\]


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