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13 January, 13:20

A man stands on a platform that is rotating (without friction) with an angular speed of 1.2 rev/s; his arms are outstretched and he holds a brick in each hand. The rotational inertia of the system consisting of the man, bricks, and platform about the central vertical axis of the platform is 6.0 k g times m squared. If by moving the bricks the man decreases the rotational inertia of the system to 2.0 k g times m squared, what is the resulting angular speed of the platform in rad/s

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  1. 13 January, 15:58
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    resulting angular speed = 3.6 rev/s

    Explanation:

    We are given;

    Initial angular speed; ω_i = 1.2 rev/s

    Initial moment of inertia; I_i = 6 kg/m²

    Final moment of inertia; I_f = 2 kg/m²

    From conservation of angular momentum;

    Initial angular momentum = Final angular momentum

    Thus;

    I_i * ω_i = I_f * ω_f

    Making ω_f the subject, we have;

    ω_f = (I_i * ω_i) / I_f

    Plugging in the relevant values;

    ω_f = (6 * 1.2) / 2

    ω_f = 3.6 rev/s
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