A rectangular bar of aluminum (2014-T4) has a length of 2.400 m and cross-sectional dimensions of 25 mm by 50 mm when the temperature is 20°C.
(a) At what temperature would the length be 2.405 m if the bar is unrestrained?
(b) If the temperature is increased an additional 30°C while the bar is restrained from growing lengthwise, compute the resulting stress in the bar.
(c) Is the stress level safe?
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