![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce1e4a0b7206902c648614cee152fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
A.![]() ![]() |
B.![]() ![]() |
C.电源的输出功率先增大后减小 |
D.电源的输出功率先减小后增大 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec1dbd146f44dfb4b5a6bb702f2435e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/270ddac9587bf1ea553914cb69595ab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a6a294d3d7206bcdde5b943dbe94f0.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
(2)凹槽的质量M;
(3)E点到圆轨道最低点的距离;
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaa12de54dcf2d1954a0c6a6dda6ab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f2f0289418ebf91e467568205624372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/972defaf6b9578d2d5270abd50e7944b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e139500613edcfa9a090f8a0b6c70b4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/256bd7b5d175621a3150f08923fe5d7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86f752a711071211bec5e2c8b39ddca7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4902ab1a261369dada902f6f76c67c28.png)
(1) 求第一次碰撞后瞬间 A、B 小球的速度;
(2)如果两小球第二次第三次碰撞都发生在电场中,则在第二次与第三次碰撞之间,有一个时刻B小球合力的瞬时功率为0。求此时刻AB两小球动能之比:
(3)现要求两小球
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/49ef72cb-6ba2-4e11-bce2-02675acf9691.png?resizew=291)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d7b9d9bf0d5fc25c99170ab27fa4045.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5e3aebedbaf6cef18b53428361c63f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c69a23d106fd34aa17b22e9c9a8de36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c066fe2dab196548b03b7b9a14841dbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44c235d8b49207ad3f2d77dc5d6cf20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0119def4b6cd8a2854d31ae88cbcc287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f64b2c2bc08996d91ced22b663f6e727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437035532f9a8a6401c1612489f51028.png)
(1)金属棒的质量m的大小;
(2)水平磁场边界ep的长度d为多少;
(3)金属棒在水平导轨上运动时,外力所需做的功。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71ec1c318e614f9568b51e61ca742599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29fcfb12e163306ea5bfc7e26600da58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6967ec3aaf9e7e6a9d90533b8ff61d10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a650347791f83266e9e8109215f376e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce036c8968b49661ecef7839984f0c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f881cb9071ca8fea7cef4ab8d4865589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf1e112631229a6b8e155a7b4b058fc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a831fae871c9028a347e59294f7422ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db0758d5878a469b85f4612573db940.png)
(1)物体从P点下滑到A点的过程中,摩擦力做的功;
(2)物体第一次向右通过传送带的过程中,传送带对物体的冲量大小;
(3)物体第一次与小球碰后到最终的过程中因为物体在传送带上滑动而多消耗的电能。
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/82d2dca3-08e8-4f18-ad06-935f49390e9f.png?resizew=386)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33a910077740728308228b41343d0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddc380999834766ff76bcfc9f6571da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e85a0085e21256f112a2453a2a437f2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeb9a94e392f6759b18abed89aacc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab6bd64fa9a48221a13bcb0159e585b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e46bfa36e7cb9e8f1487ee57e35784.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3f71acb65d3a3b45cf1765059da5af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799edf593e3ba2b2372a83d9782be3a2.png)
(1)求液滴第一次从O点经过x轴到第4次经过x轴所需时间;
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54811503c75c904b8c50e7c2596eab3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd120ce45ab580e6b2a0069fba48e0b0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/16/e802d8ab-2ff4-4b34-aa12-9ef87b6e5dee.png?resizew=387)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a8c7b2f38178c903c102a535eb0ba30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f754c99f82c63629abd47a350523080d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799edf593e3ba2b2372a83d9782be3a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/600bff6c-0c36-4529-91af-b8a812bbcf91.png?resizew=278)
A.红、黄冰壶碰撞后瞬间,黄冰壶的最小速度为![]() |
B.红、黄冰壶碰撞前瞬间,红冰壶的最大速度为![]() |
C.红冰壶在投掷线推出时的速度大于![]() ![]() |
D.红冰壶在投掷线推出时的速度大于![]() ![]() |
(1)如图1所示,电子以初速度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f58888df91890a19a1aa7511d19703f.png)
(2)某同学认为在两个带电导体之间可以存在如图2所示的静电场,它的电场线相互平行,但间距不等。请你结合静电场的基本性质,判断这种电场是否存在,并分析论证;
(3)大质量的物体在空间会激发类似于电场的引力场,引力场的“场强”大小可用置入其中的检验物体所受引力与其质量的比值表示,即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab5bfae34bafc0db8f66f3723d73ecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f28d80a3ded7c62dfce5d1173b6aec2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b628d87cb667a0a31766a88c6c426324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/193eb54202058484605527b7f75d9aba.png)
①用基本单位导出引力场“场强”和引力势的单位;
②该匀质球体的质量M为多大;
③求球心与球表面间的引力势之差
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b560afdc883bb71ddb7b9998306029.png)
④质量为m的小物块在球面处需具有多大的径向速度才可以刚好运动到2R处?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/b346ff28-8617-4d24-a029-5fdfdf470815.png?resizew=428)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/b9627f77-66a7-46ba-b6c6-ebcb0d574efe.png?resizew=162)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f58888df91890a19a1aa7511d19703f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b915ea3069054b7389cee9827dd613c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c55ec3fc6a2a218803229a6fe3ab2679.png)
(1)t=0时刻长木板的加速度大小;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c7eb49a823f757461cd5260757b088.png)
(3)若在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd84a8f95166367063218ee03ffd5a7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/8b302654-c1dc-40ec-aada-8240830f3ec9.png?resizew=310)
10 . 某兴趣小组设计的连锁机械游戏装置如图所示。左侧有一固定的四分之一圆弧轨道,其末端B水平,半径为3L;在轨道末端等高处有一质量为m的“”形小盒C(可视为质点),小盒C与大小可忽略、质量为3m的物块D通过光滑定滑轮用轻绳相连,左侧滑轮与小盒C之间的绳长为2L;物块D压在质量为m的木板E左端,木板E上表面光滑,下表面与水平桌面间动摩擦因数
(最大静摩擦力等于滑动摩擦力),木板E右端到桌子右边缘固定挡板(厚度不计)的距离为L;质量为m且粗细均匀的细杆F通过桌子右边缘的光滑定滑轮用轻绳与木板E相连,木板E与定滑轮间轻绳水平,细杆F下端到地面的距离也为L;质量为0.25m的圆环(可视为质点)套在细杆F上端,环与杆之间滑动摩擦力和最大静摩擦力相等,大小为0.5mg。开始时所有装置均静止,现将一质量为m的小球(可视为质点)从圆弧轨道顶端A处由静止释放,小球进入小盒C时刚好能被卡住(作用时间很短可不计),此时物块D对木板E的压力刚好为零。木板E与挡板相撞、细杆F与地面相撞均以原速率反弹,最终圆环刚好到达细杆的底部。不计空气阻力,重力加速度为g,求:
(2)小球在四分之一圆弧轨道上克服摩擦力所做的功;
(3)木板E与挡板碰后,向左返回的最大位移;
(4)细杆F的长度。