名校
1 . 筒车是我国古代发明的一种水利灌溉工具,因其经济又环保,至今还在农业生产中得到应用,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.假定在水流稳定的情况下,筒车上的每一个盛水筒都做匀速圆周运动.如图,将筒车抽象为一个几何图形(圆),筒车的半径为
,筒车转轮的中心
到水面的距离为
,筒车每分钟沿逆时针方向转动4圈.规定:盛水筒
对应的点
从水中浮现(即
时的位置)时开始计算时间,且以水轮的圆心
为坐标原点,过点
的水平直线为
轴建立平面直角坐标系
.设盛水筒
从点
运动到点
时所经过的时间为
(单位:
),且此时点
距离水面的高度为
(单位:
),则
与
的函数关系式为______ ,点
第一次到达最高点需要的时间为______
.
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2020-10-17更新
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7卷引用:河南省2020-2021学年高三10月联考数学理科试题