Problem 9 (10 points) In Fig. 4, a constant horizontal force Fapp of magnitude 10 N is applied to a wheel of mass 10 kg and radius 0.30 m. The wheel rolls smoothly on the horizontal surface, and the acceleration of 5 Fapp Figure 4: its center of mass has magnitude 0.60 m/s'. (a) In unit-vector notation, what is the frictional force on the wheel? (b) What is the rotational inertia of the wheel about the rotation axis through its center of mass? Solution