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JEE Main & Advanced Physics Thermometry, Calorimetry & Thermal Expansion Question Bank Calorimetry

  • question_answer
    Hailstone at 0°C falls from a height of 1 km on an insulating surface converting whole of its kinetic energy into heat. What part of it will melt \[(g=10\,m/{{s}^{2}})\] [MP PMT 1994]

    A)            \[\frac{1}{33}\]                   

    B)            \[\frac{1}{8}\]

    C)            \[\frac{1}{33}\times {{10}^{-4}}\]                                   

    D)            All of it will melt

    Correct Answer: A

    Solution :

                       Suppose m¢ kg ice melts out of m kg then by using                    \[W=JQ\] Þ \[mgh=J({m}'L)\]. Hence fraction of ice melts            \[=\frac{{{m}'}}{m}=\frac{gh}{JL}=\frac{9.8\times 1000}{4.18\times 80}=\frac{1}{33}\]


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