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(1)若物块进入圆弧轨道BCD后恰好不脱轨,求物块在传送带上运动的时间;
(2)若传送带的速度为3m/s,求物块经过圆弧轨道EFG最低点G时,轨道对物块的作用力大小;
(3)若传送带的最大速度为5m/s,在不脱轨的情况下,求滑块在木板上运动过程中产生的热量Q与传送带速度v之间的关系。
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(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。
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(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)匀强电场的场强
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b628d87cb667a0a31766a88c6c426324.png)
(3)小球到达水平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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(1)若P从斜面高
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
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(2)若P从斜面高
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe8178b450c1f5ec1f88a8feef3428e2.png)
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(3)若P从斜面高
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(1)第一次试飞时,无人机到达Q点的动能与初动能之比;
(2)第二、三次试飞时牵引力的大小和方向;
(3)在x下方有某区域,该区域上边界平行于x轴如图虚线所示。重新调整无人机,使其在第四、五次试飞前获得全新的相同初动能,当无人机在关闭引擎状态从P点水平向右飞出后,两次到达
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A.刚释放小球时小球的加速度的大小为3.5m/s2 |
B.若小球能到达C点,释放点与A的距离至少为1.2m |
C.若小球恰能到达C点,此运动过程中小球对轨道的最大压力为75N |
D.若小球恰能到达C点,则在C点对轨道的压力为0 |
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(1)若小滑块恰能沿轨道运动到G点, 求小滑块的初速度大小(结果可用根号表示);
(2)若小滑块恰能沿轨道从A点运动到K点, 求小滑块在DEF圆轨道运动时对轨道
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)若小滑块最终能停在FG轨道上,且运动过程中不脱离轨道,求小滑块的初速度大小范围(结果可用根号表示)。
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/b022b5fe-44b1-4e72-ba43-2e84fa40cdba.png?resizew=180)
A.B对A的摩擦力所做的功等于A的动能的增量 |
B.外力F做的功等于A和B动能的增量 |
C.A对B的摩擦力所做的功等于B对A的摩擦力所做的功 |
D.外力F对B做的功等于B的动能的增量与B克服摩擦力所做的功之和 |
9 . 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。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb22412d17def2ac7ad91b0730b04086.png)
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(1)物体1在运动第1个位移L过程中,地面对物体1所做的功;
(2)物体1与物体2相撞后瞬间的速度;
(3)物体3最终的位置坐标。
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975612110528512/2976409237897216/STEM/b2ef897c-a355-4803-b9aa-cefc0482d0c8.png?resizew=552)