如图所示,电灯的重力G=10 N,AO绳与顶板间的夹角为30°,BO绳水平,试求AO绳和BO绳拉力的大小。
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/651a051a-5c81-4185-b8dd-8e06378ac074.png?resizew=164)
更新时间:2020-05-10 09:31:08
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【知识点】 用三角形法则解决平衡问题
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【推荐1】如图所示,轻绳一端固定在天花板上,另一端连接一质量为m的小球.小球在水平向右的F力作用下处于平衡状态.此时轻绳与竖直方向夹角为
.已知重力加速度为g.
![](https://img.xkw.com/dksih/QBM/2018/12/16/2097953559912448/2100319975555072/STEM/0636c1a9-737f-4312-bce5-94793d998c30.png?resizew=207)
(1)请计算出F力的大小;
(2)如果F力可以绕小球在纸面内缓慢旋转,小球仍处于静止状态,则F力的最小值为多大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://img.xkw.com/dksih/QBM/2018/12/16/2097953559912448/2100319975555072/STEM/0636c1a9-737f-4312-bce5-94793d998c30.png?resizew=207)
(1)请计算出F力的大小;
(2)如果F力可以绕小球在纸面内缓慢旋转,小球仍处于静止状态,则F力的最小值为多大.
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【推荐2】如图所示,物体的质量为
,
,
取
,横梁
为水平轻杆,且
端用铰链固定在竖直墙上,轻绳
拴接在
端,求:(计算结果可用根号表示)
(1)轻绳
段的张力
的大小;
(2)轻杆
对
端的支持力。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93e63c53405fc79ce84b9c2cb56586bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c2021fc6bb0b8f2ae09cb2958377edf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276509f01529d982ab21e479a4619268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5935fb92942338e95229fdb926d6c506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03fcb360984721a5600d426949ccdb14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf64643144ce16930bd20cb438b999a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)轻绳
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82d6b83a5dc6b15f3d5feff1a2d73faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52280bbb685b179014cf2be96d20ff1c.png)
(2)轻杆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03fcb360984721a5600d426949ccdb14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca66a268d6f46e0e9d5d9151b785be60.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/32b2c50d-e507-4412-9620-c032dc3df113.png?resizew=160)
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