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A brass ring with inner diameter 2.00 cm and outer diameter 3.00 cm needs to fit...

A brass ring with inner diameter 2.00 cm and outer diameter 3.00 cm needs to fit over a 2.00-cm-diameter steel rod, but at 20 degrees Celsius the hole through the brass ring is 40 μm too small in diameter.

To what temperature, in degrees Celsius, must the rod and ring be heated so that the ring just barely slips over the rod?

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