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初中物理汽车功率怎么变化
更新时间: 2021-05-06 23:30:32  

1、这类计算题或选择题,通常要借助于两个方程,一个是瞬时功率:P=Fv;

2、另一个是牛顿第二运动定律:F-f=m*a;

3、往往汽车会有两种运动情况,这两个方程要用两次。

4、还要注意,有的题还要用匀变速直线运动公式及动能定理联立求解。

关键词: 初中 物理 汽车 功率 怎么 变化

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