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    Question

    A stone of mass 16 kg is attached to a string 144 m long

    and it is whirled in a horizontal circle. The maximum tension in the string can withstand is 16 N. The maximum velocity of revolution that can be given to the stone without breaking it, is
    A 2 m/s Correct Answer Incorrect Answer
    B 4 m/s Correct Answer Incorrect Answer
    C 6 m/s Correct Answer Incorrect Answer
    D 12 m/s Correct Answer Incorrect Answer

    Solution

    For circular motion, Maximum tension = Centripetal force ∴ T = mv2/r Given, T= 16 N, m= 16 kg, r=144 m ∴ 16 = (16 x v2)/ 144 ⇒ v2 = 144 ⇒ v = 12 m/s

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