NEET Sample Paper NEET Sample Test Paper-58

  • question_answer
    A string is wound round the rim of a mounted flywheel of mass 20kg and radius 20cm. A steady pull of 25N is applied on the cord, the angular acceleration of wheel is, [neglecting friction]

    A) \[50{{s}^{-2}}\]                      

    B) \[25{{s}^{-2}}\]

    C) \[2.5{{s}^{-2}}\]                     

    D) \[6.25{{s}^{-2}}\]

    Correct Answer: A

    Solution :

    [a] Torque =Fr Torque = \[I\alpha \] \[Fr=I\alpha \] \[25\times \frac{20}{100}=\frac{20}{2}\frac{20}{100}\frac{20}{100}\alpha \] \[\alpha =\frac{25}{2}=12.5{{s}^{-2}}\] MOI (I) Flywheel (disc)\[=\frac{M{{R}^{2}}}{2}\]


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