What is the angular speed of a point on the outer edge of the Frisbee?

Question

A Frisbee of radius 5 inches that is spinning on a person's finger makes 19.5 revolutions in 17 seconds.

 

 

Answer 1

The angular speed is the number of radians per unit time or the number of revolutions per unit time.

Angular speed is 19.5/17 = 1.15 revol per second, each revol is 2∏ radians so the angular velocity will be 2∏ times 1.15 = 2.3∏ radians per second.