题目内容
有一条捕鱼小船停靠在湖边码头,小船又窄又长,一位同学想用一个卷尺粗略测定它的质量,他进行了如下操作:首先将船平行码头自由停泊,然后他轻轻从船尾上船,走到船头后停下,而后轻轻下船,用卷尺测出船后退的距离d,然后用卷尺测出船长L.已知他自身的质量为m,则渔船的质量为 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250046124664158.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250046124664158.jpg)
A.![]() | B.![]() |
C.![]() | D.![]() |
B
试题分析:据题意,人从船尾走到船头过程中,动量守恒,则有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004612559646.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004612575873.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004612590885.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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C.![]() | D.![]() |