题目内容
(11分) 如图8,一轻质弹簧两端连着物体A和B,放在光滑水平面上,物体A被水平速度为v0的子弹射中并嵌在其中,已知物体B的质量为mB,物体A的质量
,子弹的质量
,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241218047283017.jpg)
求:(1)物体A被击中后的速度
;
(2)子弹射入木块后系统损失的机械能ΔE;
(3)物体B在运动中的最大速度
。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804604484.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804713494.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241218047283017.jpg)
求:(1)物体A被击中后的速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804744200.gif)
(2)子弹射入木块后系统损失的机械能ΔE;
(3)物体B在运动中的最大速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804760209.gif)
(1)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804775450.gif)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804791589.gif)
(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804806442.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804775450.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804791589.gif)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804806442.gif)
(1)子弹射入过程,对子弹和A木块构成的系统,
水平方向动量守恒:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804838643.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804869374.gif)
(2)系统损失的机械能:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241218048841054.gif)
(3)子弹停留在A木块中后,子弹和A构成一个整体C与弹簧作用,当弹簧的长度再次恢复原长时,B的速度最大,对于C、弹簧、和B构成的系统:
动量守恒:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804900590.gif)
机械能守恒:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804916825.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804931635.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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