题目内容
如图所示为一小球做平抛运动的闪光照相照片的一部分,图中背景方格的边长均为5 cm。如果取g="10" m/s2,那么,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241443094501626.png)
(1)闪光频率是________ Hz.
(2)小球运动中水平分速度的大小是________ m/s.
(3)小球经过B点时的速度大小是________ m/s.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241443094501626.png)
(1)闪光频率是________ Hz.
(2)小球运动中水平分速度的大小是________ m/s.
(3)小球经过B点时的速度大小是________ m/s.
10、1.5、2.5
(1)根据竖直方向
,得
,得T=0.1s,频率为10Hz;
(2)水平分速度
;
(3)B点的竖直方向分速度为
,则小球经过B点时的速度为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144310012955.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144309622626.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144309746692.png)
(2)水平分速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241443098561074.png)
(3)B点的竖直方向分速度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241443099491304.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144310012955.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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