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A solid cylinder with a mass of 266 kg and radius 0.070 m is rotating with an angular speed of 88.0 rad/s about an axis passing through its center and perpendicular to its end faces. The rotation of the cylinder is slowed down by a factor of 2 by applying a tangential frictional force to it for 6.5 s. What is the magnitude of the friction force applied to the cylinder?

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