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近几年物理竞赛题中常出现关于汽油机和柴油机功率和效率的类型题.这部分试题是把物理知识应用于实际的典型实例.在考试过程中,学生做错的较多.究其原因,它是属于力学综合题,它涉及到许多物理知识点,如:压力的计算、功的计算、热机、功率的计算,还有单位换算等等.这些对于初中生来说具有很大的难度,所以解此类型题的关键是找出突破口及
In recent years, questions about the type of power and efficiency of gasoline engines and diesel engines often appear in physics contest questions. This part of the questions is a typical example of applying physical knowledge to practice. During the examination process, students do more mistakes. The reason is that It belongs to the comprehensive problem of mechanics, it involves many physical knowledge points, such as: the calculation of pressure, the calculation of work, the calculation of heat engine, power, and unit conversion, etc. These are very difficult for junior high school students, so The key to solving this type of problem is to find the breakthrough and