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13.1 A steel ball of radius 2.45 cm fits through the middle of an aluminum ring of radius 2.46 cm when the temperature is 20o

C
AFor what temperatures will the steel ball no longer fit through the ring?
BIf the ball was made of aluminum and the ring made of steel, how would your answer change?

Verified Answer :

just for b: 
if a is correct and aluminum expands less than iron, then yes, the answer would change. The ring would, without problem, fit through the ring, without problems.

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