Banking Physics Wave Mechanics Question Bank Mechanics

  • question_answer A gymnast takes turns with her arms and legs stretched. When she pulls her arms and legs

    A)  the angular velocity decreases

    B)  the moment of inertia decreases  

    C)  the angular velocity stays constant

    D)  the angular momentum increases

    Correct Answer: B

    Solution :

     Since no external torque act on gymnast, so angular momentum (L= Iw) is conserved. After pulling her arms & legs, the angular velocity increases but moment of inertia of gymnast, decreases in, such a way that angular momentum remains constant.

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