作者a01057327 (深海心情)
看板Physics
标题[请益] 热力学问题(第一定律)
时间Wed Oct 20 22:23:14 2010
问题如下
Steam at a constant pressure of 30 atmospheres is admitted to the cylinder of
a steam engine. the length of the stroke is 0.5m and the diameter of the
cylinder is 0.4m. How much work is done by the steam per stroke?
我想要用W=beta times PVdT - kappa times PVdP
可是我发现我不知道水蒸气的expansivity还有isothermal compressibility
後来我想说 假设他是定压 dP就等於零 只要知道expansivity就可以 可是又发现我不
知道温度变化
救命啊~~~这题要怎麽解阿 我只知道V=2pi *10^-4
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