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27 January, 14:34

A spinning rigid body has a rotational kinetic energy of 10 j and an angular speed of 10 s-1. what is its rotational inertia?

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  1. 27 January, 14:46
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    Rotational kinetic energy = Iω²/2 = 10

    I = rotational inertia (moment of inertia)

    ω = angular speed = 10 s⁻¹

    ∴ 10 = I (10²) / 2

    ∴ I = 20/10² = 0.2 kg-m²
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