题目内容
如图为某小球从斜面某点无初速度释放、向下做匀加速直线运动的频闪照片,已知频闪相机从小球下滑至A点开始拍摄,此后每隔0.1s曝光一次,测得图中AB=12cm,BC=20cm。求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241252200942373.jpg)
小题1:小球在图中B点的速度大小;
小题2:小球运动的加速度大小及A点离释放点的距离。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241252200942373.jpg)
小题1:小球在图中B点的速度大小;
小题2:小球运动的加速度大小及A点离释放点的距离。
小题1:1.6m/s
小题2:4cm
(1)设曝光时间为T,
∵小球做初速度为0的匀加速直线运动,
∴
①
(2)据
得:
,
;②
∵
,
据
得:
③
④
∵小球做初速度为0的匀加速直线运动,
∴
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241252201101383.gif)
(2)据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125220235458.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125220250553.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125220282865.gif)
∵
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125220297436.gif)
据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125220313507.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125220328906.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241252203441401.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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