A small ruber wheel is used to drive a larger potter wheel, and they are mounted so that their circular edges touch. If the small wheel has a radius of 2.0 cm and accelerates at the rate of 7.2 rad/s^2 and it is in contact with the potter wheel (radius 25.0 cm) without slipping, calculate (a) the angular acceleration of the pottery wheel ,and (b) the time it takes the potter wheel to reach its required speed of 65 rpm