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Derive the expression to determine gyroscopic couple.
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  • Gyroscopic couple (C ):

    Let w be angular velocity of a disk.

    Let wp be angular velocity of precession (rotation of axis of spin)

    Let the axis of spin be rotated by an angle dθ in time dt

    L1 = Iw

    L2 = Iw + Iw sin(dθ) ≈ Iw + …

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