1 . 如图所示,水平地面与光滑半圆轨道
平滑连接,半圆轨道的半径为
,
为半圆轨道的竖直直径,
为半圆轨道沿水平方向的半径。质量为
的遥控电动赛车(可视为质点)从水平地面上的
点由静止以恒定功率
沿水平地面向右加速运动,当到达
点时关闭发动机,赛车恰好能通过半圆轨道的
点。已知
、
两点间的距离为
,赛车在地面上运动时受到的阻力大小恒为
(
为重力加速度大小),不计空气阻力。求:
(1)赛车通过
点后在水平地面上的落点到
点的距离;
(2)赛车通过
点瞬间,半圆轨道对赛车的弹力
的大小;
(3)赛车从
点运动到
点的时间
。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da165d3d3de8812ab633e6276ed907b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/381a6397c08fb494da3601d44ee08613.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276509f01529d982ab21e479a4619268.png)
(1)赛车通过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)赛车通过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4367f2fd8581477f7a4fd702a4de7d83.png)
(3)赛车从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d9fd58e71dcae6cafaf9037d20ebd76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/81cea9c7-a830-4515-9698-92e144201411.png?resizew=263)
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2 . 如图甲所示,滑块从斜面底端以平行于斜面的初速度
冲上固定斜面,沿斜面上升的最大位移为
。已知斜面与滑块间的动摩擦因数
,最大静摩擦力等于滑动摩擦力、动能
与沿斜面位移x之间关系如图乙所示,向上滑行图线斜率的绝对值为
,向下滑行图线斜率的绝对值是
,则滑块在斜面上受摩擦力大小为( )
![](https://img.xkw.com/dksih/QBM/2021/6/29/2753498805633024/2754088847908864/STEM/b31ff803-c44a-4394-8ee0-cbe9a1aae04f.png?resizew=290)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f58888df91890a19a1aa7511d19703f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be42bf4d5326ab4fca4f27a4a4b68742.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef1c7229e345be3a4857b91d27126c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://img.xkw.com/dksih/QBM/2021/6/29/2753498805633024/2754088847908864/STEM/b31ff803-c44a-4394-8ee0-cbe9a1aae04f.png?resizew=290)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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3 . 如图所示,小滑块在水平外力F作用下,沿水平地面从A点由静止向右滑行,滑至B点时撤去外力F,到达C点时速度恰为零,不计空气阻力。则下列说法中正确的是( )
![](https://img.xkw.com/dksih/QBM/2020/9/8/2545577968943104/2545968531783680/STEM/ec92536f-bc62-4644-b893-ac40689749b4.png?resizew=212)
![](https://img.xkw.com/dksih/QBM/2020/9/8/2545577968943104/2545968531783680/STEM/ec92536f-bc62-4644-b893-ac40689749b4.png?resizew=212)
A.BC段滑块动量的改变量大于阻力的冲量 |
B.AB段和BC段滑块动量的变化量相同 |
C.滑块运动的全过程,F的功与克服阻力的功相等 |
D.滑块运动的全过程,F的冲量与阻力的冲量相同 |
您最近一年使用:0次
2020-09-09更新
|
231次组卷
|
3卷引用:湖南省岳阳市平江县颐华高级中学(平江)2022-2023学年高二下学期开学考试物理试题