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JEE Main & Advanced Physics Two Dimensional Motion Question Bank Uniform Circular Motion

  • question_answer
    An electric fan has blades of length 30 cm as measured from the axis of rotation. If the fan is rotating at 1200 r.p.m. The acceleration of a point on the tip of the blade is about                                      [CBSE PMT 1990]

    A)             1600 \[m/{{\sec }^{2}}\]     

    B)             4740 \[m/{{\sec }^{2}}\]

    C)             2370 \[m/{{\sec }^{2}}\]

    D)                      5055 \[m/{{\sec }^{2}}\]

    Correct Answer: B

    Solution :

                    \[{{\omega }^{2}}r=4{{\pi }^{2}}{{n}^{2}}r\]=\[4{{\pi }^{2}}{{\left( \frac{1200}{60} \right)}^{3}}\times 30\]\[=4740\,m/{{s}^{2}}\]


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