作业帮SAT2物理 求救求救【急】The work done to a system is characterized as negative.The work done by a system is characterized as positive.为什么to就是negative,by是postive?这两句话是在热力学中看到的！
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SAT2物理 求救求救【急】The work done to a system is characterized as negative.The work done by a system is characterized as positive.为什么to就是negative,by是postive?这两句话是在热力学中看到的！
SAT2物理 求救求救【急】
The work done to a system is characterized as negative.
The work done by a system is characterized as positive.
为什么to就是negative,by是postive?
这两句话是在热力学中看到的！
SAT2物理 求救求救【急】The work done to a system is characterized as negative.The work done by a system is characterized as positive.为什么to就是negative,by是postive?这两句话是在热力学中看到的！
环境对系统做功为”负”
系统对外做功为“正”,
to是接受,system是受体,翻译过来也就是环境对系统做功
by是主动,system是施体,翻译过来也就是系统对环境做功
系统对外界做功，W为负值
外界对系统做功，W为正值。
to是做功给别人
by是被别人做功