Suppose that a disk rotates through two revolutions in 5.5 seconds.

Question

(a) What is its displacement in radians in this time?
(b) What is its average rotational velocity in rad/s?

Answer 1

a.)2π radians = 1 revolution
4π radians = 2 revolutions
4*π=12.56637061 rad

b.) (2rev/ 5.5sec)(2π radians/revolution)
(0.363636)(6.283185301)
= 2.284794657