2022年6月5日,神舟十四号载人飞船成功与天和核心舱对接形成组合体,并于12月4日成功返回地面.本次任务的完成见证了货运飞船与空间站交会对接最快世界纪录等众多历史性时刻.如图,神舟十四号返回舱接近地面时,伞面是表面积约为
的半球面(不含底面圆),伞顶
与返回舱底端
的距离为半球半径的
倍,直线
在水平地面上的投影为
,
和观测点
在同一水平线上.在遥控观测点
处测得点
的仰角为
,线段
的视角(即
)的正弦值为
,则此时返回舱底端离地面的高度约为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8aa17d320afae5297b0c750e829098e.png)
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A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
更新时间:2023-07-09 16:31:07
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【推荐1】2020年12月8日,中国和尼泊尔联合公布珠穆朗玛峰最新高程为
(单位:
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A.180 | B.200 | C.220 | D.240 |
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解题方法
【推荐2】如图,线段AB表示一信号塔,DE表示一斜坡,
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,
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