如图所示,半径为
的半球形碗固定于水平面上,碗口水平,
点为碗的圆心,
为水平直径的两个端点。将一弹性小球(可视为质点)从
点沿
方向以初速度
水平抛出,小球与碗内壁碰撞一次后恰好经过
点;若将该小球从离
点
处的
点以初速度
水平抛出,小球与碗内壁碰撞一次后恰好返回
点。假设小球与碗内壁碰撞前后瞬间小球的切向速度不变,沿半径方向的速度等大反向,则
与
的比值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.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/f44c235d8b49207ad3f2d77dc5d6cf20.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/5e2a611e62fe0d6c6519a16b25423cec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/814f55724f7ee57bd395eb3b95393c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/814f55724f7ee57bd395eb3b95393c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44c235d8b49207ad3f2d77dc5d6cf20.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/17/2a48c10c-19ff-4ac6-b1a5-cc6a922d5544.png?resizew=175)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-07-17 19:25:14
|
【知识点】 曲面结合的平抛运动
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【推荐1】如图所示,滑道ABC为四分之一圆弧,半径为2m,O为其圆心,C为圆弧最低点,与地面相切,在和O点等高的某位置水平抛出一个小球,垂直击中圆弧上的B点。弧AB的长度是弧BC的长度的2倍。忽略空气阻力,g取10m/s2,则抛出点与O点水平距离是( )
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A.1m | B.2m |
C.![]() | D.![]() |
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【推荐2】如图所示,直角坐标系
的
轴水平向右、y轴竖直向下,一挡板的曲线形状满足方程
,现从坐标原点以速率
竖直向上抛出小球甲,经过时间
返回到坐标原点,再从坐标原点以速率
水平向右抛出小球乙,经过一段时间
落到挡板上,不计空气阻力,重力加速度g取
,则
为( )
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958698537459712/2960033084407808/STEM/6103e710-1cf0-409a-a275-71acf48dc0ad.png?resizew=172)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb12c7085ac80b0b2d6393764a0be9cd.png)
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958698537459712/2960033084407808/STEM/6103e710-1cf0-409a-a275-71acf48dc0ad.png?resizew=172)
A.1:1 | B.1:2 | C.1:4 | D.1:6 |
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