1. The problem statement, all variables and given/known data A constant horizontal force app of magnitude 15 N is applied to a wheel of mass 8.9 kg and radius 0.39 m. The wheel rolls smoothly on the horizontal surface, and the acceleration of its center of mass has magnitude 0.76 m/s2. (a) What is the magnitude of the frictional force on the wheel? (b) What is the rotational inertia of the wheel about the rotation axis through its center of mass? 2. Relevant equations -------- 3. The attempt at a solution I don't even know where to begin for either part. For (b) I tried using several rotational inertia equations; however, none of the ones I used worked.