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NEET Sample Paper NEET Sample Test Paper-88

  • question_answer
    A wheel having moment of inertia \[2\,kg-{{m}^{2}}\] about its vertical axis, rotates at the rate of 60 rpm about this axis, The torque which can stop the wheel's rotation in one minute would be

    A) \[\frac{\pi }{18}Nm\]     

    B)        \[\frac{2\pi }{15}Nm\]

    C) \[\frac{\pi }{12}Nm\]                 

    D) \[\frac{\pi }{15}Nm\]

    Correct Answer: D

    Solution :

    [d] \[\tau \times \Delta t={{L}_{0}}\]       \[\{\therefore since\,{{L}_{f}}=0\}\] \[=\tau \times \Delta t=I\omega \] or \[=\tau \times 60=2\times 2\times 60\pi /60\] \[\left( \therefore \,\,\,\,f=60rpm\,\,\,\,\therefore \omega =2\pi f=2\pi f=2\pi \times \frac{60}{60} \right)\] \[\tau =\frac{\pi }{15}N-m\]


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