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在压强p-温度T的坐标系中,一定质量的某种理想气体先后发生以下两种状态变化过程:第一种变化是从状态A到状态B,外界对该气体做功为6J;第二种变化是从状态A到状态C,该气体从外界吸收热量为9J.图线AC反向延长线通过坐标原点O,B、C两状态的温度相同,理想气体的分子势能为零.求:(1)从状态A到状态C过程,该气体对外界做功W1和其内能的增量△U1;(2)从状态A到状态B过程,该气体内能的增量△U2及其从外界吸收的热量Q2.
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