位于卫辉市东南隅的镇国塔,是河南省重点保护文物.镇国塔为七层六角楼阁式砖塔,塔每层的六个角上都悬挂着一个风铃,风吹起的时候叮当作响,悦耳动听.某数学小组在老师的指导下,测算镇国塔的高度.如图,已知
,在点D处测得镇国塔的顶端E的仰角为
,自A向镇国塔走
到达点B,测得镇国塔的顶端E的仰角为
(点A,B,C在一条直线上).则数学小组测算的镇国塔的高度
是多少?(结果精确到
.参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da474da2072dcb8b39c2decbc07c8e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8f23aea123f92654dd0d19aa5f98ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c113248efc8415cc10ea77607ea07bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ae4297f60550c210d7fa72333b690a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca645930231972d1a5e00cb963eced5c.png)
更新时间:2024-05-08 14:37:05
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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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解答题-问答题
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适中
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【推荐1】某镇为创建特色小镇,助力乡村振兴,决定在辖区的一条河上修建一座步行观光桥.如图,该河旁有一座小山,山高
m,坡面
的坡比为
(注:坡比是指坡面的铅垂高度与水平宽度的比),点
、
与河岸
,
在同一水平线上,从山顶
处测得河岸
和对岸
的俯角
,
分别为
,
.(参考数据:
,
,
)
![](https://img.xkw.com/dksih/QBM/2022/12/11/3128404877942784/3142808790302720/STEM/47249e70e96c4f4aa2528cb44ac691d3.png?resizew=353)
(1)求山脚
到河岸
的距离;
(2)若在此处建桥,试求河宽
的长度.(结果精确到0.1m)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a453eea7193e6a45b1138f11df3460.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b75958bf56eec07d5332dcb3647e91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1a13346c7971d064ef14cecd9a9ed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc26cc7a314e20192020c2a1d52ae3ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ed69f1776cf29883f6bdfeb0cafd9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1ef386b284eb2f3d3d5a9775612d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03293ed1366537ee27631e921b63e7e9.png)
![](https://img.xkw.com/dksih/QBM/2022/12/11/3128404877942784/3142808790302720/STEM/47249e70e96c4f4aa2528cb44ac691d3.png?resizew=353)
(1)求山脚
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)若在此处建桥,试求河宽
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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解答题-问答题
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适中
(0.65)
真题
【推荐2】中国“蛟龙”号深潜器目前最大深潜极限为7062.68米.某天该深潜器在海面下1800米处作业(如图),测得正前方海底沉船C的俯角为45°,该深潜器在同一深度向正前方直线航行2000米到B点,此时测得海底沉船C的俯角为60°.
(1)沉船C是否在“蛟龙”号深潜极限范围内?并说明理由;
(2)由于海流原因,“蛟龙”号需在B点处马上上浮,若平均垂直上浮速度为2000米/时,求“蛟龙”号上浮回到海面的时间.(参考数据:
≈1.414,
≈1.732)
(1)沉船C是否在“蛟龙”号深潜极限范围内?并说明理由;
(2)由于海流原因,“蛟龙”号需在B点处马上上浮,若平均垂直上浮速度为2000米/时,求“蛟龙”号上浮回到海面的时间.(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2014/9/26/1573750243958784/1573750249840640/STEM/2deea4f91f494e54a0e7b777ca4fff95.png)
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