Solution of the D2 B9. The platform rotates with angular velocity w0 = 3 rad / s, the resistance forces begins to decelerate, a moment which is equal to M = 10w (w + 3). The moment of inertia of the platform with respect to the rotation axis equals J = 435 kgm2. Determine the number of revolutions of the platform from the start of braking until standstill.

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