Question

(b) A brass disc is fitted strongly in a hole in a steel plate. What will you do (heat or cool)
with the system to loosen the brass disc from the hole? ( alpha steel < alpha brass)
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Answer 1

Answer:

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Explanation:

Thermal expansion coefficient of brass is ˜ 20 × 10-6 /°C whereas that of steel is ˜ 15 × 10-6 /°C. Hence brass expands/shrinks faster than steel. So the brass disc from the hole of steel plate can be loosened if the system is cooled.