1 . 如图所示,粗糙水平地面与半径
的光滑半圆轨道
在
点平滑连接,
点是半圆轨道
的圆心,
三点在同一竖直线上,质量
的小物块(可视为质点)静止在水平地面上的
点.某时刻用一压缩弹簧(未画出)将小物块沿
方向水平弹出,小物块经过
点时速度大小为
(不计空气阻力).已知
,小物块与水平地面间的动摩擦因数
,重力加速度大小
.求:
![](https://img.xkw.com/dksih/QBM/2018/7/19/1991903561515008/1994189380018176/STEM/20fac52532144ca3a51519b7f9ef0643.png?resizew=147)
(1)压缩弹簧的弹性势能;
(2)小物块运动到半圆轨道最高点时,小物块对轨道作用力的大小;
(3)小物块离开最高点后落回到地面上的位置与
点之间的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/185ad6620818563a5de71aab78d621b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.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/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91f994d5f38721aa1137a4e5ebae64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dee915e2fb7b8a1f4328473f9c18ba7.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3400becda01dd5e0be6d0d4755d3d8ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73d82ca6e52a6d2b25ff1f57d0333f00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5af0b91538a80d81fdf2e954f045e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799edf593e3ba2b2372a83d9782be3a2.png)
![](https://img.xkw.com/dksih/QBM/2018/7/19/1991903561515008/1994189380018176/STEM/20fac52532144ca3a51519b7f9ef0643.png?resizew=147)
(1)压缩弹簧的弹性势能;
(2)小物块运动到半圆轨道最高点时,小物块对轨道作用力的大小;
(3)小物块离开最高点后落回到地面上的位置与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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