1 . 筒车是我国古代发明的一种水利灌溉工具,既经济又环保,明朝科学家徐光启在《农政全书》中用图画描绘了筒车的工作原理(如图1).假定在水流量稳定的情况下,筒车上的每一个盛水筒都做匀速圆周运动.如图2,将筒车抽象为一个半径为
米的圆,筒车按逆时针方向每旋转一周用时
秒,当
时,筒车上的某个盛水筒
位于点
处,经过
秒后运动到点
,点
的纵坐标满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90023aacf3760996af5caa6b5b63c86.png)
.已知筒车的轴心
距离水面的高度为
米,设盛水筒
到水面的距离为
(单位:米)(盛水筒
在水面下时,则
为负数).
(1)将距离
表示成旋转时间
的函数;
(2)求筒车在
秒的旋转运动过程中,盛水筒
位于水面以下的时间有多长?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfd121f4aeca8a78a320fca1fd1c4d07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeb9a94e392f6759b18abed89aacc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51130e462257f92d74b3ff6e04d7b485.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee82283f06cedef32eb15b87964f5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90023aacf3760996af5caa6b5b63c86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e17becdd855f98d3bffd8df962a9514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/16/d7396a21-86ce-47ec-9b2b-259594e33798.png?resizew=323)
(1)将距离
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)求筒车在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/467d8625b4253b4988a096650f9805bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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