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]
Long steam pipes that are fixed at the ends often have a fszd4c7q 8t u2rm2wlht50 -lgsection in thexu.x(oh-wr0 j8v ru*z shape of a U. Why?.u zhxjuor(vrx8* 0 w-
参考答案: The
steam pipe can have a large temperature change as the steam enters or leaves
the pipe. If the pipe is fixed at both
ends and the temperature changes significantly, there will be large thermal
stresses which might break joints. The
“U” in the pipe allows for expansion and contraction which is not possible at
the fixed ends. This is similar to the
joints placed in concrete roadway surfaces to allow expansion and contraction.
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