A uniform cylindrical grindstone has a mass of 16.6 kg and a radius of 17.9 cm. The grindstone reaches a rotational velocity of 1.556 + 3 rev/min before its motor turns off. After the grindstone's motor is turned off, a knife blade is pressed against the outer edge of the grindstone with a perpendicular force of 5.37 N. The coefcient of kinetic friction between the grindstone and the blade is 0.80. Use the work energy theorem to determine how many turns the grindstone makes before it stops