为了打击海盗犯罪,甲、乙、丙三国海军进行联合军事演习,分别派出一艘军舰A,B,C.演习要求:任何时刻军舰A、B、C均不得在同一条直线上.
![](https://img.xkw.com/dksih/QBM/2020/5/14/2462455338942464/2462529888206848/STEM/78ea64daae6f413099ef73ec54136ab5.png?resizew=338)
(1)如图1,若演习过程中,A、B间的距离始终保持
,B,C间的距离始终保持
,求
的最大值.
(2)如图2,若演习过程中,A,C间的距离始终保持
,B、C间的距离始终保持
.且当
变化时,模拟海盗船D始终保持:到B的距离与A、B间的距离相等,
,与C在直线AB的两侧,求C与D间的最大距离.
![](https://img.xkw.com/dksih/QBM/2020/5/14/2462455338942464/2462529888206848/STEM/78ea64daae6f413099ef73ec54136ab5.png?resizew=338)
(1)如图1,若演习过程中,A、B间的距离始终保持
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc448773bb8b895764d5167319fc48b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5ba8a548022dcd972b2630619911bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
(2)如图2,若演习过程中,A,C间的距离始终保持
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0252c1bbb760ce3dd9160097bab409.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a5d9d5fbff267ed16d2d6079ffa88b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b6d19fedaf8488f9637cd64efbca83.png)
2020·江苏南通·模拟预测 查看更多[2]
更新时间:2020-05-14 14:12:47
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【推荐1】某轮船以
海里/小时的速度航行,在
点测得海面上油井
在南偏东60度.轮船从
处向北航行30分钟后到达
处,测得油井
在南偏东15度,且
海里.轮船以相同的速度改为向东北方向再航行60分钟后到达
点.(
)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/902d239f-c299-43b1-a073-780d0c84a5c1.png?resizew=88)
(1)求轮船的速度
;
(2)求
两点的距离(精确到1海里).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ace91c4056a437037119bd834f6e2588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9a7a5642a15fccb563ef748f2973fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/902d239f-c299-43b1-a073-780d0c84a5c1.png?resizew=88)
(1)求轮船的速度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfaa712e64750e3e2843bae68ebad6d1.png)
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【推荐2】如图,在曲柄
绕
点旋转时,活塞
作直线往复运动,设连杆
长为
,曲柄
长
,求曲柄
从初始位置
按顺时针方向旋转
时,活塞
移动的距离
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c56f6c570f673e46dacb99ce139e52ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baf35aca9d4852c0be45bb8c33477d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3411cc31aec1f591278dba83b11e9c7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47f16646a42799ee60b931181b64acdf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/c9f14bd0-d3b4-47da-9746-e44907472cd3.png?resizew=159)
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解题方法
【推荐1】如图,第25届中国机器人及人工智能大赛总决赛中,主办方设计了一个矩形坐标场地
(包含地界和内部),
长为12米,在
边上距离B点5米的E处放置一只机器犬,在距离B点2米的F处放置一个机器人,机器人行走的速度为v,机器犬行走的速度为
,若机器犬和机器人在场地内沿着直线方向同时到达场地内某点P,则机器犬将被机器人捕获,点P叫成功点.
(2)若N为矩形场地
边上的一点,若机器犬在线段
上都能逃脱,问N点应在何处?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b96fa109cded3a52a56e03e4b358851.png)
(2)若N为矩形场地
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
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【推荐2】如图,某海面上有
、
、
三个小岛(面积大小忽略不计),
岛在
岛的北偏东
方向
处,
岛在
岛的正东方向
处.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/1b789c13-d0c6-4021-a1fe-bdb839f64022.png?resizew=240)
(1)以
为坐标原点,
的正东方向为
轴正方向,
为单位长度,建立平面直角坐标系,写出
、
的坐标,并求
、
两岛之间的距离;
(2)已知在经过
、
、
三个点的圆形区域内有未知暗礁,现有一船在
岛的南偏西
方向距
岛
处,正沿着北偏东
行驶,若不改变方向,试问该船有没有触礁的危险?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38092ae2fb52cfa5e0017c7eb73381fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe602366f921c3c0e58c3f524646be8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/1b789c13-d0c6-4021-a1fe-bdb839f64022.png?resizew=240)
(1)以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e4917c34a4c4e654ace35eb65f179b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)已知在经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996bf3d35b6763cbc1a423b13a9df2dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba80a2abb9e6a7fd35c5b4c4d20cf779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
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