J & K CET Medical J & K - CET Medical Solved Paper-2005

  • question_answer
    A geostationary satellite is revolving around the earth. To make it escape from gravitational field of earth, its velocity must be increased :

    A)  100%                                   

    B)  41.4%

    C)  50%                                      

    D)  59.6%

    Correct Answer: B

    Solution :

                     The period of revolution of geostationary satellite is the same as that of the earth. Orbital velocity                 \[{{v}_{o}}=\sqrt{g{{R}_{e}}}\] Escape velocity \[{{v}_{e}}=\sqrt{2g{{R}_{e}}}\] where\[{{R}_{e}}\]is radius of earth. % increase \[=\frac{{{v}_{e}}-{{v}_{o}}}{{{v}_{o}}}\times 100\] % increase \[=\frac{\sqrt{2g{{R}_{e}}}-\sqrt{g{{R}_{e}}}}{\sqrt{g{{R}_{e}}}}\times 100\] \[=(\sqrt{2}-1)\times 100\]                 \[=(1.414-1)\times 100=41.4%\]


You need to login to perform this action.
You will be redirected in 3 sec spinner