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9th Class Science Gravitation and Floatation Question Bank Gravitation and Pressure

  • question_answer
    Two spheres each of mass \[105\,\,kg\] and radius \[10\,\,m\] are kept in contact. Find the force of gravitation acting between them.

    A) \[{{10}^{-3}}N\]         

    B)        \[6.67\times {{10}^{-3}}N\]  

    C) \[6.67\times {{10}^{-11}}N\]    

    D)        \[{{10}^{-11}}N\]

    Correct Answer: B

    Solution :

     \[{{F}_{g}}=\frac{G{{m}_{1}}{{m}_{2}}}{{{r}^{2}}}=\frac{6.67\times {{10}^{-11}}\times {{10}^{5}}\times {{10}^{5}}}{{{(10)}^{2}}}\] \[=6.67\times {{10}^{-1}}\times {{10}^{-2}}=6.67\times {{10}^{-3}}N\]


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