1. The problem statement, all variables and given/known data The angular position of a point on the rim of a 18.7 cm rotating wheel is given by θ(t) = 4.7 t2 − 7.2 t +9.7, where θ is measured in radians and t is measured in seconds. What is the instantaneous angular acceleration α of the point at time t = 6 s? What is the instantaneous tangential (not radial!) acceleration a of the point at time t =6 s? What is the instantaneous angular velocity ω of the point at time t = 9 s? What is the instantaneous speed v of the point at time t = 9 s? What is the average angular speed ωav of the point over the time interval starting time t = 6 s and ending at the time t = 9 s? Through what angular displacement Δθ does the wheel turn during this time? 3. The attempt at a solution I get the angular position of 135.7 radian at 6 seconds but I do not understand where to go from there. I cannot just use those for angular velocity/acceleration right? Thanks.