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JEE Main & Advanced Physics Gravitation / गुरुत्वाकर्षण Question Bank Kepler's Laws of Planetary Motion

  • question_answer
    The maximum and minimum distances of a comet from the sun are \[8\times {{10}^{12}}\,m\] and \[1.6\times {{10}^{12}}\,m\]. If its velocity when nearest to the sun is 60 m/s, what will be its velocity in m/s when it is farthest                         [Orissa 2001]

    A) 12       

    B)             60

    C)             112     

    D)             6

    Correct Answer: A

    Solution :

        By conservation of angular momentum mvr  = constant \[{{v}_{\min }}\times {{r}_{\max }}={{v}_{\max }}\times {{r}_{\min }}\] \\[{{v}_{\min }}=\frac{60\times 1.6\times {{10}^{12}}}{8\times {{10}^{12}}}=\frac{60}{5}=12\,m/s\]


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