A fine steel wire is attached to an aluminum cylinder in parallel (see picture I'll attach below). The structure is assembled at 10.0°C under negligible stress. The initial length of the system is
85.0 cm long.
The system is heated to 120°C. Calculate the resulting stress in the wire, assuming that
the rod expands freely. Justify the assumption that the rod freely expands.

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Is the strain on the Al rod as it expands equal to the stress on the steel wire?

Or do I use the formula \[\frac{F}{A} = -Y \alpha \Delta T\]

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