Disk A has a mass of 4 kg and a radius r = 75 mm; it is at rest when it is placed in contact with the belt, which moves at a constant speed v = 18 m/s. Knowing that μ_k = 0.25 between the disk and the belt, determine the number of revolutions executed by the disk before it reaches a constant angular velocity.

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C Fig. P 17.7 V