A steel ring of inner diameter 7.00000 cm at 20.0 °C is to be heated and placed over a brass shaft of outer diameter 7.00200 cm at 20.0 °C.
(a) To what temperature must the ring be heated to fit over the shaft? The shaft remains at 20.0 °C.
(b) Once the ring is on the shaft and has cooled to 20.0 °C, to what temperature must the ring plus shaft combination be cooled to allow the ring to slide off the shaft again?