题目内容
(16分)小明为了向同学展示自己神奇的“魔力”,将一小型条形磁铁藏在自己的袖子里,然后对着一悬挂的金属小球指手画脚,结果小球在他神奇的功力下飘动起来,同学们都惊讶了!假设当隐藏的小磁铁位于小球的左上方某一位置C(
)时,金属小球偏离竖直方向的夹角
也是
,如图所示已知小球的质量为m,小明(含磁铁)的质量为M,重力加速度为g.求此时
(1)悬挂小球的细线拉力大小为多少?
(2)小明受到地面的支持力为多少?
(3)小明受到地面的摩擦力为多少?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241218000485185.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121800017486.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121800033200.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121800048234.gif)
(1)悬挂小球的细线拉力大小为多少?
(2)小明受到地面的支持力为多少?
(3)小明受到地面的摩擦力为多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241218000485185.jpg)
(1)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121800064526.gif)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121800080603.gif)
(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121800095538.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121800064526.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121800080603.gif)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121800095538.gif)
对小球:设细线拉力为T,磁铁对小球的引力为F
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241218001261798.gif)
对小明
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241218001421641.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241218001261798.gif)
对小明
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241218001421641.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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