The Stanford linear accelerator contains hundreds of brass disks tightly fitted into a steel tube (see figure). The coefficient of linear expansion of the brass is 2.00 10-5 per C. The system was assembled by cooling the disks in dry ice (-57C) to enable them to just slide into the close-fitting tube. If the diameter of a disk is 80.00 mm at 43C, what is its diameter in the dry ice?