20-21高一·全国·课后作业
解题方法
1 . 如图,在细绳O处用水平力
缓慢拉起所受重力为
的物体,绳子与铅垂方向的夹角为θ,绳子所受的拉力为
.
,
随θ的变化而变化的情况;
(2)当
时,求角θ的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d699e4ab6fc7e4a36a02bcd78ad5e775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53fd4eab19e84a5572cf6ce03f79a35a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce87b3aae5def54ce6484e5315d3f7c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c172dddc3c3453b64df94574dcb9ad04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d3ae5bf2a2b44728f16fb7df6e7fc8b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5acc41f3a355cc93f2dbec678bce0a85.png)
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