作者flied (libertines)
看板Physics
标题[题目] 绝热压缩求做功与内能变化
时间Sun Jun 2 10:47:40 2013
[领域] 普通物理 热力学
[来源] Halliday
[题目] Figure 19-27 shows a cycle undergone by 1.00 mol of an ideal
monatomic gas. The temperatures are T1 = 300 K, T2 = 600 K, and T3 = 455 K.
For 2 --> 3, what are (d) Q, (e) ΔE, and (f) W
http://ppt.cc/BCzR
[瓶颈]
For 2 --> 3 求 ΔE
解答是用 nCvΔT = -1810 J
http://ppt.cc/J5gG
因为绝热压缩过程
我换成另一种算法 nRΔT / (1-r)
http://ppt.cc/nfFq
r = Cp/Cv = (5R/2) / (3R/2) = 1.6
8.314 * (455-600) / (1-1.6)= -2009 J
请问这样算出来答案应该要一样但为什麽有差?
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1F:推 lucifer19:因为你r代1.6阿... 你代5/3进去算就对了 06/02 11:40
2F:→ flied:阿我算数好差,感谢指点! 06/02 11:53