![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c4ee1b7d06ac4c703e4c086b425c9c5.png)
A.若篮球从1.5m高度由静止开始下落时不拍球,则篮球反弹的高度为1.25m |
B.拍球过程中,恒力对篮球做功为1.5J |
C.恒力作用的距离为0.125m |
D.恒力的冲量为1.2N·s |
(1)求物块运动到圆弧轨道最底端时的速度大小v;
(2)求物块第二次到达C点时的速度大小v2;
(3)物块第一次压缩弹簧,弹簧获得的最大弹性势能Ep。
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/b84276aa-5dfa-4dc0-972d-40c1941323b5.png?resizew=321)
3 . 如图所示的水平轨道、倾斜直轨道
用圆弧管道连接,圆弧半径
,管道的内径远小于
,可忽略不计。直轨道与圆弧在
两点相切,各部分平滑连接,倾斜直轨道
与水平面的夹角
在同一竖直面内,质量
的滑块
放在水平直轨道离
点足够远处,质量
的滑块
停放在管口
处。略小于管道的内径,质量
的小球
,以某一初速度从物块
的右侧某处出发,经过圆弧轨道恰到达
处。两滑块与轨道的摩擦因数
,不计小球的摩擦力,小球与物块间碰撞均为弹性正碰。
(1)求小球在通过点时对管道的压力大小;
(2)求小球第一次与相碰后滑块
的动能
;
(3)增大小球向右出发的速度,小球在处与滑块
碰撞,碰撞后滑块上升到最远处离
点的距离
。在
处有一特殊装置,使小球与滑块
相碰后能停在管口,直到再次与滑块相碰,小球再次离开
处。小球通过与滑块的反复碰撞最终停止,求滑块
在水平轨道上滑行的总距离
。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3607714050663c99950fa962d4b0cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f881cb9071ca8fea7cef4ab8d4865589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53089bdb898dfc103aabaa082cc1d380.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135585680f39a0765c519616f61c4d3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b58221e12691cb48d9d2ee9b0dd5239b.png)
(1)滑水者经过C点时对圆弧轨道的压力大小
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2e202679724436724bee1b7f1038a1d.png)
(2)滑水者落入水中面D点瞬间的速度大小
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/814f55724f7ee57bd395eb3b95393c68.png)
(3)斜面上AB两点的距离l。
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/cd015bb2-f60b-4388-8c11-5517624a9a9c.png?resizew=254)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f754c99f82c63629abd47a350523080d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fda5655ef480683a2d3b74f0b523439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc94f2ea411c691d91a4fc6665c24ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c4b86a39a5983796d94e59c413d73d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc85da509804b909468738ebb48ced1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f500e27e0044c4fe12f40e72918b1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/046088b2c52eab1e3ce47d662866cea6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61719b93fffcf4db181c9e9d9b4f46b3.png)
(1)BO连线与水平方向的夹角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)小滑块P到达与O点等高的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
(3)弹簧的弹性势能的最大值;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/6a137368-bec2-4735-935a-b6281891f6e9.png?resizew=220)
6 . 如图所示,在离粗糙水平直轨道CD高处的A点有一质量
的物块
可视为质点
,现将物块以某一初速度水平抛出后,恰好能从B点沿切线方向进入光滑圆弧形轨道BC。B点距水平直轨道CD的高度
,
点为圆弧形轨道BC的圆心,圆心角为
,圆弧形轨道最低点C与长为
的粗糙水平直轨道CD平滑连接。物块沿轨道BCD运动并与右边墙壁发生碰撞,且碰后速度等大反向,已知重力加速度
,不计空气阻力。求:
(1)物块从A点刚抛出时的初速度大小;(结果可以用根式表示)
(2)物块运动至圆弧形轨道最低点C时,物块对轨道的压力大小;
(3)若物块与墙壁发生碰撞且最终停在轨道CD上,则物块与轨道CD间的动摩擦因数应满足的条件。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cd458653e047a899fbb50b96deb3ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/119fc12ccbcdeb8120d6b6b889d0a4c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/702c1c0ecc87cdd627cf5a09f4216b94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b92ad873b02d0a95aed7d13bb8aa6b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d18c93355b8ef85b997c1604dd4aef07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd6a64b062371e2c934ec968bbaf3e23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b23b86285dd2eab4c2c78fb22e417bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a6a294d3d7206bcdde5b943dbe94f0.png)
(1)A与B碰撞后瞬间的共同速度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b880095f70eb2b08105e19c506c3bca6.png)
(2)AB与C达到共同速度时,此时AB离C右端的距离x多大;
(3)在C被墙壁锁定后,为了避免人碰撞到墙壁,且保证人不掉到冰面上,在AB与墙壁距离为x时,人把B以速度vB推出,B与墙壁碰后立即被锁定,试讨论vB的取值范围(答案中包含x)。
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/2aabc9c8-64f4-44ff-9286-db9e3b7e6f18.png?resizew=261)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c24a9a1c94a5ed97fa6728a260cc118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4f150ab98bde511e0f65d9bafab031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7249973335d45990d03e3a69442354.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a6a294d3d7206bcdde5b943dbe94f0.png)
(1)滑块的电性和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
(2)若电场
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
(3)在第(2)问的条件下,若电场
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4f150ab98bde511e0f65d9bafab031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950e2cd5e10a110b71a1a902da4f8765.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4f150ab98bde511e0f65d9bafab031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4f150ab98bde511e0f65d9bafab031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a2701bc2b64385c02b643d7ed1bb04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f6f9e0a22c99ec9b50a14d88015117c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23538cb9ed9006dac52e3304b44b7762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd744db650389e17a3920d51ea2ca202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d2a258ac4c381635f30595c204f17d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95ffff1a5698f98c6863a4d5df053dca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d8dd0407d3f84229856d301d85041f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e18f2cf399b536420d45b1b44cd97dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65239bec2b92f0f64da183ba9e8529e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67722f940d1db0fa4f84640cdc9f3ea7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a831fae871c9028a347e59294f7422ec.png)
(1)甲刚离开斜面时的速度大小;
(2)弹簧最初的弹性势能;
(3)木板运动的总路程。
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/27980bdb-61be-47ed-b11c-b7b7332734f7.png?resizew=457)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0fd54d4f16b529e4d26030d1a6b34f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d729278b1feb35d06a6e9ea25072cad8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348ce836848895cea9feb93d5c02bd41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f58888df91890a19a1aa7511d19703f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced8cbb708a1c7b367d9a14c8eaa691b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a6a294d3d7206bcdde5b943dbe94f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17f7ab83c2c0bbcaabc2a177855d55d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8abd04c286268987607ca633e02688bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22964de2a093c97a8755dbe70487735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd1846e964fd60c54888a3c706a97442.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/25/fae23457-4471-4b43-bd94-1bc9db9e3fb8.png?resizew=309)