问题:
发布时间:2020-03-13
质量为
的物体以速率
在半径为
的圆周上做匀速圆周运动,在一个周期内,它受到的合外力冲量是( )
A.0
B.![](http://picflow.koolearn.com/upload/papers//20140824/20140824122323640351.gif)
C.![](http://picflow.koolearn.com/upload/papers//20140824/20140824122323655335.gif)
D.因向心力是变力,无法求出
质量为
![](http://picflow.koolearn.com/upload/papers//20140824/20140824122323609312.gif)
![](http://picflow.koolearn.com/upload/papers//20140824/20140824122323624304.gif)
![](http://picflow.koolearn.com/upload/papers//20140824/20140824122323640316.gif)
A.0 |
B.![]() |
C.![]() |
D.因向心力是变力,无法求出 |
参考答案: