题目内容
一只乒乓球质量为
,从离桌面高为
处由静止释放,假设它与桌面碰撞反弹时不损失机械能,但由于受到大小不变的空气阻力的影响(空气浮力不计),每次反弹的高度是它下落时高度的
。求:
(1)空气阻力的大小;
(2)它停止运动前通过的总路程;
(3)为使乒乓球每次都能返回到
高处,每当它到达
高处时,应给它多大的动能?
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507505337.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507521313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507537385.png)
(1)空气阻力的大小;
(2)它停止运动前通过的总路程;
(3)为使乒乓球每次都能返回到
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507521313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507521313.png)
(1)
;(2)
;(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507630833.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507599638.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507599456.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507630833.png)
试题分析:(1)根据动能定理
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250005076461058.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507599638.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507693608.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507599456.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507521313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507521313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000507771970.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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