At room temperature (20 degrees c) a 0.5-mm gap exists
betweenthe ends of the rods shown. at a later time when
thetemperature has reached 140 degrees c determine (a) the
normalstress in the aluminum rod, (b) the change in lenth of the
aluminumrod.

answer:

my guess it 8 i'm probably wrong

answer:

explain:

we don't have any choices.

answer:

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