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9th Class Science Gravitation and Floatation Question Bank Gravitation

  • question_answer
    A man weighs 60 kg at earth's surface. At what height above the earth's surface his weight becomes 30 kg? ( radius of earth = 6400 km).

    A)  1624 km             

    B)  2424 km

    C)  2624km          

    D)         2826km

    Correct Answer: C

    Solution :

     Above the earth's surface,\[{{g}_{1}}=\frac{g}{{{\left( 1+\frac{h}{R} \right)}^{2}}}\] But changed weight \[=\] half of its weight on earth. \[\Rightarrow \]               \[{{g}_{1}}=\frac{g}{2}\] \[\therefore \]  \[h=2624\,\,km\].


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