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Thread: 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
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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 $\displaystyle |I \omega|=|m\, v\, r|$ , where $\displaystyle m$ is the mass of the man $\displaystyle v$ his speed, $\displaystyle r$ the radius of the platform $\displaystyle I$ the moment of inertia of the platform and $\displaystyle \omega$ 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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