我的思路是:初动能:mgr末动能:mgr*m/(M+m)动能改变量mgr*M/(M+m)等于摩擦力乘以相对位移x即mgr*M/(M+m)=μmg*x得x=r*M/[μ*(M+m)]所以A\D都对但答案只有A麻烦看一下我的思路:两位回答的不是我的问题
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/17 15:59:35
![我的思路是:初动能:mgr末动能:mgr*m/(M+m)动能改变量mgr*M/(M+m)等于摩擦力乘以相对位移x即mgr*M/(M+m)=μmg*x得x=r*M/[μ*(M+m)]所以A\D都对但答案只有A麻烦看一下我的思路:两位回答的不是我的问题](/uploads/image/z/6139920-48-0.jpg?t=%E6%88%91%E7%9A%84%E6%80%9D%E8%B7%AF%E6%98%AF%EF%BC%9A%E5%88%9D%E5%8A%A8%E8%83%BD%EF%BC%9Amgr%E6%9C%AB%E5%8A%A8%E8%83%BD%EF%BC%9Amgr%2Am%2F%28M%2Bm%29%E5%8A%A8%E8%83%BD%E6%94%B9%E5%8F%98%E9%87%8Fmgr%2AM%2F%28M%2Bm%29%E7%AD%89%E4%BA%8E%E6%91%A9%E6%93%A6%E5%8A%9B%E4%B9%98%E4%BB%A5%E7%9B%B8%E5%AF%B9%E4%BD%8D%E7%A7%BBx%E5%8D%B3mgr%2AM%2F%28M%2Bm%29%3D%CE%BCmg%2Ax%E5%BE%97x%3Dr%2AM%2F%5B%CE%BC%2A%28M%2Bm%29%5D%E6%89%80%E4%BB%A5A%5CD%E9%83%BD%E5%AF%B9%E4%BD%86%E7%AD%94%E6%A1%88%E5%8F%AA%E6%9C%89A%E9%BA%BB%E7%83%A6%E7%9C%8B%E4%B8%80%E4%B8%8B%E6%88%91%E7%9A%84%E6%80%9D%E8%B7%AF%EF%BC%9A%E4%B8%A4%E4%BD%8D%E5%9B%9E%E7%AD%94%E7%9A%84%E4%B8%8D%E6%98%AF%E6%88%91%E7%9A%84%E9%97%AE%E9%A2%98)
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