如图,已知一条河的两岸平行,河的宽度为d,某人从河的北岸出发到河对岸,河水自西向东流速为
,设某人在静水中游泳的速度为
,在流水中实际速度为
.
![](https://img.xkw.com/dksih/QBM/2021/4/23/2706042458505216/2706092895207424/STEM/aab43ef3-e048-4bd9-9ba8-d5368fe72182.png?resizew=272)
(1)如果要使此人游得路程最短,且
,求此人游泳的方向与水流方向的夹角
和
的大小;
(2)如果要使此人游得时间最短,且
,求他实际前进的方向与水流方向的夹角
和
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9477a1ea8e26bda1c919ee9cefa4cd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44c235d8b49207ad3f2d77dc5d6cf20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/814f55724f7ee57bd395eb3b95393c68.png)
![](https://img.xkw.com/dksih/QBM/2021/4/23/2706042458505216/2706092895207424/STEM/aab43ef3-e048-4bd9-9ba8-d5368fe72182.png?resizew=272)
(1)如果要使此人游得路程最短,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/446b985fee98569230374547dab3796b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/814f55724f7ee57bd395eb3b95393c68.png)
(2)如果要使此人游得时间最短,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efbd2baa9486c3926d625836e589fc43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44c235d8b49207ad3f2d77dc5d6cf20.png)
20-21高一下·江苏苏州·期中 查看更多[5]
江苏省苏州市第三中学2020-2021学年高一下学期期中数学试题(已下线)6.4.1 平面向量在几何和物理中的运用(精练)-2021-2022学年高一数学一隅三反系列(人教A版2019必修第二册)苏教版(2019) 必修第二册 过关斩将 章节测试 第9章 平面向量(已下线)高一数学下学期第一次月考模拟试卷(平面向量+三角恒等变换)-【题型分类归纳】2022-2023学年高一数学同步讲与练(苏教版2019必修第二册)(已下线)6.4.2 向量在物理中的应用举例 (分层作业)-【上好课】
更新时间:2021-04-23 17:03:00
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解答题-问答题
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适中
(0.65)
解题方法
【推荐1】如图,在平行四边形
中,设
,
, 则
(1)当
,
满足什么条件时,
与
垂直?
(2)当
,
满足什么条件时,
?
(3)
与
可能是相等向量吗?
(4)当
,
满足什么条件时,
平分
与
所夹的角?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac265febbf99dccf51aa0a2253e61f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a44a918c7cfd942d3a53e584c26685a8.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cc3b82a73fae9b0d470e315cc870101.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cd8bbf47b69bbd7a6263b041290d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bca35e52b8430246a1cf96e9e617cce.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cc3b82a73fae9b0d470e315cc870101.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef84d275246c94cd7d9c983231210fd.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cd8bbf47b69bbd7a6263b041290d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bca35e52b8430246a1cf96e9e617cce.png)
(4)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cc3b82a73fae9b0d470e315cc870101.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cd8bbf47b69bbd7a6263b041290d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
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【推荐2】已知质点O受到三个力
,
,
的作用,若它们的大小分别为
,
,
,且三个力之间的夹角都是
,求合力的大小和方向.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d91ab71d264b823aa7532695f97cbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2440236a84a8bb60ffa3dee1a2cde3e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d10736b9c51c99a910c337e8b48027f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54ee607b58eb717338f571f0e22856c4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/978a9f8b3171d3cda17433c6441cf681.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
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【推荐1】在某河流南岸某渡口处,河水以大小为
的速度向东流,渡船在静水中的速度大小为
.渡船要垂直地渡过该河,其航向应如何确定?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7160c36ff2c7b95cbafd8f9ed860fc65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f2ef612f49f4765e46cd9bbb703a0a.png)
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解题方法
【推荐2】已知
,
,一动点P从
开始,沿着与向量
相同的方向做匀速直线运动,速度的大小为
.另一动点Q从
开始,沿着与向量
相同的方向做匀速直线运动,速度的大小为
,设P,Q在
时分别在
,
处,问当
时,所需的时间t为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b86b3ff4e6d25b7fedd7f0e86092b44c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c270787a9f4386ef278f12cfdfa28c75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6397893c31fc14f8d00a41b05b865de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ba71e05cc450bb5f2e683414c3f8fbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79f7b0630a4fe5c2d89b12ef3ee94c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ad8acf06bc84080121faa55d579382d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a080a6503ffba9ba042221cec21b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79e82ad329a20a0375ffd4b55cf1797e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31f589948322f25bbae2a7de786b88c9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e53fc891ae5ef554ce5f1ad0cbe9ae69.png)
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