A wheel starts from rest and rotates about its axis with constant angular acceleration. After 8.7s have elapsed, it has rotated through an angle of 20 radians.

Question

A wheel starts from rest and rotates about its axis with constant angular acceleration. After 8.7s have elapsed, it has rotated through an angle of 20 radians.
What is the angular acceleration of the wheel? 
What is the angular velocity when the time t = 8.7 s? I got the answer of 4.60 rad/s
What is the centripetal acceleration of a point on the wheel a distance r = 0.25 m from the axis at t = 8.7 s?

hung truong · Answer

20 rad/s^2 4 rad/s 10 rad/s^2