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  3. 9th Class
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  5. Gravitation and Floatation

9th Class Science Gravitation and Floatation Question Bank Gravitation Formative Objective Problems

  • question_answer
    At what height above the earths surface does the acceleration due to gravity fall to 1% of its value at the earths surface?

    A)  R                                           

    B)  5 R   

    C)  10 R                      

    D)  9 R

    Correct Answer: D

    Solution :

      \[{{g}^{1}}=g\,\,\left( \frac{{{R}^{2}}}{{{(R+h)}^{2}}} \right)\] \[\frac{1}{100}=\,\,\left( \frac{{{R}^{2}}}{{{(R+h)}^{2}}} \right)\Rightarrow h=9R\]


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