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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2011

  • question_answer
        If an object weigh 270 N at the earths surface, what will be the weight of the object at an altitude equal to twice the radius of earth?

    A)  270 N                                   

    B)  90 N

    C)  30 N                                     

    D)  60 N

    Correct Answer: C

    Solution :

                    Let m is the mass of object and g is acceleration due to gravity at earths surface then \[mg=270N.\] The acceleration due to gravity at an altitude of\[2{{R}_{e}}\]is,                 \[g=\frac{GM}{{{({{R}_{e}}+2{{R}_{e}})}^{2}}}-=\frac{g}{9}\] So, required weight \[=mg=\frac{mg}{9}=30\,N\]


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