Torque with Kinematic Equations Practice Problems

A rotating disk with a radius of 2.50 m and a moment of inertia of 2200 kg•m² about its central vertical axis is initially at rest. A person applies a tangential force of 20.0 N to the edge of the disk for 12.0 s. Calculate the angular velocity of the disk after this 12.0 s period.

A solid uniform disk with a mass of 350 g and diameter of approximately 5.00 cm rotates around an axis passing through its center but at one point on its circumference, there's metal scraping against it causing frictional force worth approximately 0.025 N at that particular point. How much time will be required for the rotational speed to decrease by 25.0 rad/s?