本题目来源于试卷: gc textbook chapter 13 temperature and kinetic theory，类别为 通用国际物理
[问答题]
(a) A horizontal steel I-beam obx+ dx+z0o llpjt 6bv ule,o 0ie qthk)5)771qf cross-sectional area 0.04v u t 6qjkhv8+e;8smyd0qk 1l11$m^2$ is rigidly connected to two vertical steel girders. If the beam was installed when the temperature was 30$^{\circ} $ C, what stress is developed in the beam when the temperature drops to -30 $^{\circ} $ C (b) Is the ultimate strength of the steel exceeded? (c) What stress is developed if the beam is concrete and has a cross-sectional area of 0.13$m^2$ Will it fracture?
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