题型:解答题-计算题
难度:0.65
引用次数:203
题号:13111220
某建筑工地的平衡力矩塔吊如图所示,在配重点
处测得塔帽
的仰角为30°,在点
的正下方23米处的点
处测得塔帽
的仰角为53°,请你依据相关数据计算塔帽与地面的距离
的高度.(计算结果精确到
米,参考数据:
,
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87796ee30e6c5d5e6b6285b32abe10c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47bb3f35e3db7c1f3a3dd3eb20151b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/888e6e9e6ca20554cc98547b1a3f8bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04390bfdcc0c4707fd43a2c0b6a585f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7664a5f9b61fd010eda340986ca34b47.png)
![](https://img.xkw.com/dksih/QBM/2021/4/21/2704779075076096/2706974939316224/STEM/89299360b93a490db22e64f787a00c68.png?resizew=334)
更新时间:2021-04-24 22:57:31
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【知识点】 仰角俯角问题(解直角三角形的应用)
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【推荐1】图1是某住宅单元楼的人脸识别系统(整个头部需在摄像头视角范围内才能被识别),其示意图如图2,摄像头A的仰角、俯角均为
,摄像头高度
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.(精确到0.1cm参考数据:
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,
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)
的小杜,头部高度为
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的点C处,请问小杜最少需要下蹲多少厘米才能被识别?
(2)身高
的小若,头部高度为
,踞起脚尖可以增高
,但仍无法被识别,社区及时将摄像头的仰角,俯角都调整为
(如图3),此时小若能被识别吗?请计算说明.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a1b68822169ec4cfb0e76a0a4ab2dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db936261aa0625846ad56e78c3647d8a.png)
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(2)身高
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84755b560534a4cab0c57e1a31cb656c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc31bf4b6ed8cf336432a5a2791e67e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976260cbf5e30856d4fd37a4b0a671a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aee6e4e9350a2665df8597ff8045bbd.png)
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【推荐2】如图,建筑物
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,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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