Determine the angular acceleration of each of the two wheels as they roll without slipping down the inclines. For wheel A, investigate the case where the mass of the rim and spokes is negligible and the mass of the bar is concentrated along its centerline. For wheel B, assume that the thickness of the rim is negligible compared with its radius so that all of the mass is concentrated in the rim. Also specify the minimum coefficient of static friction μs required to prevent each wheel from slipping.