英语,求翻译和中文解答Can we take a bike as a mass point when we observ
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英语,
求翻译和中文解答
Can we take a bike as a mass point when we observe its wheels rotate round their axes?Can we take a moving bike as a mass point when we observe its velocity in the street?
要说理由
求翻译和中文解答
Can we take a bike as a mass point when we observe its wheels rotate round their axes?Can we take a moving bike as a mass point when we observe its velocity in the street?
要说理由
译:当我们研究自行车的轮子绕轴转动时可以把自行车当做质点吗?当我们求一运动自行车在路上行驶的速度时可以把自行车当做质点吗?答案:前者不可以,后者可以.当我们研究某一物体时如果它的形状或体积对研究没影响以致可以被忽略时可被当做质点,否则不可以
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