Posted by **emy** on Thursday, July 5, 2012 at 7:33am.

A hollow cylinder of aluminium 1 m long with a 40 mm outside diameter is at a temperature of 20 °C. What is the change in length and circumference of the cylinder when it is cooled to −25 °C?

(Note: the thermal co-efficient of expansion of aluminium is 24 × 10−6 K−1.)

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