作者kevinpe90 (kevin)
看板Physics
标题[问题] thermal stress
时间Mon Sep 22 15:21:21 2008
F/A = -YαΔT gives the stress required to keep the length of a rod
constant as its temperature changes. Show that if the length is permitted
to change by an amount ΔL when its temperature is changed by ΔT,
the stress is equal to F/A = Y(ΔL/Lο - αΔT)
帮帮忙 T__T
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机会就像老二一样, 紧握就会变大; 时间就像乳沟一样, 硬挤还是会有;
所以人生就是在乳沟中找老二,
好的机会 是经得起时间的考验的
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