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AMU Medical AMU Solved Paper-2015

  • question_answer
    If g is acceleration due to gravity on earths surface, the gain in the potential energy of an object of mass m raised from surface of the earth to a height equal to radius R of the earth is

    A)  \[2\,mg\,R\]                     

    B)  \[\,mg\,R\]

    C)  \[\frac{1}{2}\,mg\,R\]                  

    D)  \[\frac{1}{4}\,mg\,R\]

    Correct Answer: C

    Solution :

                     Change in \[PE=\frac{GMm}{R}-\frac{GMm}{(n+1)R}\]                 \[=\left( \frac{n}{n+1} \right)mgR\] where, n is integral multiple of R. Here value of-\[n=1\] \[\therefore \]  Change in \[PE=\frac{mgR}{2}\]


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