Question

You have just completed a larger-than-life bronze statue of an engineer to place next to the engineering cairn on Main Mall, in order to inspire the passing students. To complete the work, you need to place an engineer’s iron ring on the finger of the statue. At 20 degrees Celcius, the inner diameter of the iron ring is 2.5000 cm, while the outer diameter of the finger on the statue is 2.5030 cm. . In order to make the ring fit, you change the temperature of the ring and the finger together until the ring slides on.

At what temperature will this happen?

We have that α = 1.8 × 10^-5 for bronze and α = 1.2 × 10^-5 for iron.

Express your answer using two significant figures.

Answer 1