RAJASTHAN PMT Rajasthan - PMT Solved Paper-1997

  • question_answer
    Radius of earth is 6400 km. The weight of body at a height of 6400 km from surface of earth will be:

    A)  half                      

    B)         one fourth        

    C)         one third           

    D)         no change

    Correct Answer: B

    Solution :

    At earth surface \[g=\frac{GM}{{{R}^{2}}}\] At a height h from earth surface                 \[g=\frac{GM}{{{(R+h)}^{2}}}\] at            \[h=R\,\,g=\frac{1}{4}\left( \frac{GM}{{{R}^{2}}} \right)\]                 \[\,g=\frac{g}{4}\] Weight will remain


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