A motorized wheel is spinning with a rotational velocity of a0=1.57 rad/s. At r=0s, the operator switches the wheel to a higher speed setting. The rotational velocity of the wheel at all subsequent times is given by w(t) = parctan (c+ br) where c 1.5574 and b = 6.53 s2. At what time famax is the rotational acceleration at a maximum? What is the maximum tangential acceleration a, of a point on the wheel a distance R = 1.27 m from its center? a = What is the magnitude of the total acceleration of this point? m/s m/s ms