16. Angular Momentum

A solid disc of mass M = 40 kg and radius R = 2 m is free to rotate about a fixed, frictionless, perpendicular axis through its center. You apply a constant, tangential force on the disc's surface (as shown), to get it to spin. Calculate the magnitude of the force needed to get the disc to 100 rad/s in just one minute.

Which of the following statements does not use the term angular size or angular distance correctly?

What is the angular speed of the tip of the minute hand on a standard clock, in $radians$ per $second$?

A CD with initial angular velocity ${\omega }_0$ is spinning on a frictional surface and comes to rest after a time $t$ with constant angular deceleration $\alpha$. How many revolutions does the CD make before stopping?