已知棱长为2cm的正方体容器内盛满水,把半径为1cm的钢球放入水中,刚好被淹没;然后放入一个铁球,使它也淹没于水中.要使流出的水量最多,这个铁球的半径应为多少?
18-19高一·全国·课后作业 查看更多[2]
更新时间:2019-10-11 09:24:06
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【推荐1】已知正方体
的棱长为1,P是对角面
(包含边界)内一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/31/6d929a77-227a-4a50-a5d6-997b59b4111e.png?resizew=161)
(1)求
的长度;
(2)是否存在点
,使得平面
平面
?若存在,求出点
的位置;若不存在,说明理由;
(3)过点
作平面
与直线
垂直,求平面
与平面
所成锐二面角的最小值,并求此时平面
截正方体
所得截面图形的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bf9ef324f1289e205e29fed105c38e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/036de574712cad14bddadf6653c7e714.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/31/6d929a77-227a-4a50-a5d6-997b59b4111e.png?resizew=161)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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