Solution of the D2 B11. In the braking shaft operates a permanent friction torque in bearings M1 = 80 Nm torque resistance caused by magnetic coupling M2 = 60 (1 - e ^ -1,2t). The initial angular velocity of the shaft is equal to w0 = 15 rad / s. The moment of inertia about the axis of rotation is equal to J = 50 kgm2. Determine the angular velocity of the shaft at the time t = 3c.

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