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NEET Sample Paper NEET Sample Test Paper-26

  • question_answer
                                e time period of rotation of earth so as to make object weight-less on its equator is where M or r are the mass and radius of earth.

    A)  84mm    

    B)  74mm

    C)  64min            

    D)  54min

    Correct Answer: A

    Solution :

    Put  \[{{g}_{e}}=0,\] in the expression \[{{g}_{e}}={{g}_{o}}-r{{w}^{2}}\] We get             \[w=\sqrt{\frac{{{g}_{o}}}{r}}\] \[\Rightarrow \]               \[=2\pi \sqrt{\frac{r}{{{g}_{o}}}},\] putting \[r=6.4\times {{10}^{6}}m\] and        \[{{g}_{o}}=9.8m/{{s}^{2}}\] We obtain,          \[T=84\min \]


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