The given figure shows a brass disk tigh...

The given figure shows a brass disk tightly filled into a steel tube. The coefficient of linear expansion of the brass is `2.00 xx10^(-5) ` per `""^@C` . The system was assembled by cooling the disks in dry ice `(-57^@C)` to enable them to just slide into the close-fitting tube. If the diameter of a disk is 80.00 mm at `43^@C` , what is its diameter in the dry ice?

78.400 mm

79.998 mm

80.160 mm

79.840 mm

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