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

  • question_answer
    Find the gravitational attraction between the two atoms in a hydrogen molecule when \[G\] is\[6.67\times {{10}^{-11}}N{{m}^{2}}k{{g}^{-2}}\], mass of a hydrogen atom is \[1.67\times {{10}^{-27}}kg\] and distance between the two atoms is \[1\,\overset{o}{\mathop{A}}\,\].

    A) \[11.14\times {{10}^{-18}}N\]

    B) \[2.39\times {{10}^{-45}}N\]

    C) \[1.86\times {{10}^{-44}}N\]  

    D) \[4.18\times {{10}^{-23}}N\]

    Correct Answer: C

    Solution :

    \[F=\frac{G{{m}_{1}}{{m}_{2}}}{{{r}^{2}}}\]        \[=\frac{6.67\times {{10}^{-11}}\times 1.67\times {{10}^{-27}}\times 1.67\times {{10}^{-27}}}{{{\left( {{10}^{-10}} \right)}^{2}}}\]        \[=18.6\times {{10}^{-45}}N=1.86\times {{10}^{-44}}N\]


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