1. The problem statement, all variables and given/known data The combination of an applied force and a frictional force produces a constant total torque of 39.9Nm on a wheel rotating about a fixed axis. The applied force acts for 4.5s, during which time the angular speed of the wheel increases from 3 rad/s to 12 rad/s. The applied force is then removed. The wheel comes to rest in 72s. A. What is the moment of inertia of the wheel? Answer in units of kgm^2 B. What is the magnitude of the frictional torque? Answer in Nm C. What is the total number of revolutions of the wheel? 2. Relevant equations [tex]\sum[/tex][tex]\tau[/tex] = I(moment of inertia) * [tex]\alpha[/tex] 3. The attempt at a solution A. 39.9 = 2I I = 19.95 That is correct. B. T = (19.95)(9/72) = 2.49375 That is incorrect. What am I doing wrong? C. I need some help, do not know where to start. Thanks in advance. Sorry if the equations look bad. This the first time I am using Latex and I still don't know exactly how to use it correctly.