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BCECE Engineering BCECE Engineering Solved Paper-2010

  • question_answer
    A body of mass m is situated on the earth in the gravitational field of sun. For the body to escape from die gravitation pull of the solar system the body must be imparted an escape velocity of (assume earth to be stationary)

    A)  11.2km/s

    B)                         22.4 km/s

    C)  33.6 km/s          

    D)         42 km/s

    Correct Answer: D

    Solution :

    Escape velocity, \[v=\sqrt{\frac{2G{{M}_{s}}}{{{R}_{s}}}}\] \[\therefore \]  \[v=\sqrt{\frac{2(6.67\times {{10}^{-11}})(2\times {{10}^{30}})}{1.5\times {{10}^{11}}}}\]                 \[v=\sqrt{\frac{v\times 6.67\times {{10}^{8}}}{1.5}}=42\,km/s\]


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