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Math Help - Angular velocity of a platform

  1. #1
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    Angular velocity of a platform

    I don't know the idea.
    I can find momentum of inertia of disc-shaped platform but don't know how to link it with mass of a man who walks on the disc-shaped platform.
    This excercises seems to be based on momentum of impulse of conservation law


    Answer 0,70 rad/s
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by totalnewbie View Post
    I don't know the idea.
    I can find momentum of inertia of disc-shaped platform but don't know how to link it with mass of a man who walks on the disc-shaped platform.
    This excercises seems to be based on momentum of impulse of conservation law


    Answer 0,70 rad/s
    Use conservation of angular momentum, about the central pivot of the platform.

    Angular momentum of the platform is |I \omega|=|m\, v\, r| , where m is the mass of the man v his speed, r the radius of the platform I the moment of inertia of the platform and \omega the angular velocity of the platform (the platform rotates in the opposite direction to that in which the man walks.

    RonL
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