You measure a rod with a steel ruler at 20◦C, finding the length of the rod to be 15.78 cm. You place both the rod and the ruler in a 300◦C oven and see that the rod now measures to be 15.85 cm long. What is the coefficient of linear expansion for the material out of which the rod is made? What will the actual rod length be, considering the ruler also expanded in the heat?

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