1. The problem statement, all variables and given/known data A rotating wheel requires 3.05 s to rotate through 37.0 revolutions. Its angular speed at the end of the 3.05 s interval is 97.1 rad/s. What is the constant angular acceleration of the wheel? 2. Relevant equations Well from basic calculus I know that acceleration is equal to (dV/dT) or the derivative of velocity over derivative of time. That is the only pertinent equation I can think of for this problem. 3. The attempt at a solution I used the velocity, 97.1 rad/s, and divided it by the time, 3.05s. (97.1/3.05)= 31.84 rad/s^2 According to the online homework this is incorrect. I cannot think of any other way to calculate it since the radius is not given. 1. The problem statement, all variables and given/known data A racing car travels on a circular track of radius 230 m. Suppose the car moves with a constant linear speed of 53.0 m/s. (b) Find the magnitude and direction of its acceleration. Part (a) had me calculate the velocity which came out to 0.23 rad/s. The velocity is correct. 2. Relevant equations a= linear acceleration A=rotational acceleration R=radius A=a/R circumference = 2piR 3. The attempt at a solution I figured since it says a constant linear acceleration then the angular acceleration=0 because A=(0)/(230) = 0. This answer is incorrect according to the online homework. I'm not sure what else to do.