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NEET Sample Paper NEET Sample Test Paper-2

  • question_answer
    A bullet makes n turns inside the barrel of length I of a rifle and emerges from it with a speed V. Assuming that the bullet moves inside the barrel with a uniform acceleration, and uniform angular acceleration, the angular velocity of the bullet about its longitudinal exis as it emerges from the barrel is

    A)  \[\frac{V}{l}\]            

    B)  \[\frac{2\pi nV}{l}\]

    C)  \[\frac{\pi n}{2V}\]              

    D)  None of these

    Correct Answer: B

    Solution :

    As,  \[V=at\] and \[\omega =at\] \[2\pi n=\frac{1}{2}a{{t}^{2}}\]  and \[l=\frac{1}{2}a{{t}^{2}}\] (as in one turn there is \[2\pi \] radium) \[\Rightarrow \] \[\frac{2\pi n}{1}=\frac{a}{a}=\frac{w}{V}\] \[w=\frac{2\pi n}{l}V\] As two blocks are held together.


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