A $12\mathrm{.}5$ inch long AISI $1020$ bar is placed between two rigid, unvielding walls, as shown above, with only one end attached. The gap between the end of the bar and the wall is $0\mathrm{.}0061$ inches. Calculate the stress developed in the bar due to a temperature change of $1221F.$

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A $12\mathrm{.}5$ inch lang AlSI $1020$ bar is placed between two rigid, unvielding walls, as shown above, with only one end attached. The gan betwoen the end of the bar and the wall is $0\mathrm{.}0061$ inches. Giculate the stress developed in the bar due to a temperature change of $122\mathrm{.}1F.$