One way to put a steel wheel on a steel axel (for example on a railroad car) is to heat the wheel until it slides on the axel, then cool. Assume you have a 1 meter diameter steel wheel with a 10 cm diameter circular hole in the middle at room temperature (25 degrees C). You must put this on a 10.1 cm diameter axel. What temperature must the wheel be heated to? The linear thermal expansion coefficient for steel is 12*10^-6 degrees C^-1.