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NEET Sample Paper NEET Sample Test Paper-80

  • question_answer
    A stone tied to a string is rotated in a vertical plane. If mass of the stone is m, the length of the string is r and the linear speed of the stone is v when the stone is at its lowest point, then the tension in the string will be \[(g= acceleration due to gravity)\]

    A)  \[\frac{m{{v}^{2}}}{r}\,\,+\,\,mg\]                 

    B)  \[\frac{m{{v}^{2}}}{r}\,\,-\,\,mg\]

    C)  \[\frac{m{{v}^{2}}}{r}\]                    

    D)  mg

    Correct Answer: A

    Solution :

    At point B, \[{{T}_{B}}-mg=\frac{m{{v}^{2}}}{r}\] \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,{{T}_{B}}\,\,=\,\,\frac{m{{v}^{2}}}{r}+mg\]


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