![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f260fbe4d56f3592c7bd89c7c85faa7e.png)
A.N板电势低于M板电势 |
B.MN间电势差![]() |
C.每个载流子受到的洛伦兹力大小为![]() |
D.将磁场方向变为与薄片的上、下表面平行,![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3607714050663c99950fa962d4b0cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8fb7e47e7affbcc9949d6e82ed3481c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26e93d8fb77f5bd2c0fc690752dfd771.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135585680f39a0765c519616f61c4d3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b58221e12691cb48d9d2ee9b0dd5239b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/c76e329d-4164-46ab-9ac0-4eb257b77732.png?resizew=225)
A.剪断绳子的瞬间,a的加速度为![]() ![]() |
B.当![]() ![]() ![]() |
C.当![]() ![]() ![]() |
D.当![]() ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8c06a54dda8802aa6c9d98e7636b32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9224dab958970f343456e6a44401dbd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fda5655ef480683a2d3b74f0b523439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d4104687ebae5cbd25affc3aa60e72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a671e986b25c374e5d5058cd926e741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5cb62f5a011e245ef78e07a2fe5cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105ca38287c296d79f5bd660e9a43399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf189a86ac788e61722281a7b1ed7b8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f986badfc5dea707c164e2ab6c98dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8485466d2127bd681a322f87c58f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f82a15d77cd8d32de86a2030ec37a67.png)
(1)小物块刚滑上木板时,小物块和木板的加速度的大小和方向;
(2)第1次与挡板碰撞前,小物块相对木板向上滑行的最大距离;
(3)从小物块与挡板发生第1次碰撞到第15次碰撞前,小物块沿斜面滑行的距离。
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/10/0e7665ef-a943-4a1c-a060-21932179eb7c.png?resizew=269)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e70cc707cf0b979edc07072c34ba7ce3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fda5655ef480683a2d3b74f0b523439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c793c099143bfed06ffa282b76e05b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d3dfbb06f0f9783c20a5b8828f7f5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eab04ac9b36cd64bc2909d0b8160b1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fda5655ef480683a2d3b74f0b523439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe20530a6b65fc9c02aae82ddf418d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/899f0c27469567f8f33839cd3785ed17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a22e0ab4f5221776a33ce0c94d00e4c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0149d35eb2232bbec0dc9d2e466b789a.png)
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(1)货物刚放上传送带A端时的加速度大小;
(2)货物由传送带A端运动到B端的时间:
(3)若平板车长度为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9245d943e06da5a3126e9fd97ef9479.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/7/4b508281-928d-4dc5-ba4b-8d3c55a85254.png?resizew=301)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4afc3f73b6c6a5aa3bf199b7ec3911a.png)
A.河水流速大小为2m/s |
B.船的合速度大小为2m/s |
C.船的位移大小为![]() |
D.船渡河的轨迹是一条直线,且与河岸的夹角等于![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03e573fb168ca032d09c814adaf4ac3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829c3a4213dcad9afb56ad9fb3be92a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc78f8404692dc9f020e57ea7fead14f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2864092293e9b3cdf20562c79684468.png)
(1)木板第一次与挡板碰撞前瞬间的速度大小;
(2)从同时释放A、B、C到小滑块B第一次与小滑块A相碰经历的时间;
(3)若在木板C第一次与挡板D碰撞后瞬间撤去挡板,且挡板撤去后瞬间让A的速度大小突变为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d45d95c75866dcf99f8dec222bc460d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/43e9bae1-2498-4c0f-b172-7476d39a1ea2.png?resizew=290)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f71acdb04454c77e1e25ad4f336cccfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b40d86ec688a7860f47d07467d86614.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e6b7aadb20d26ab77511508e16e24b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff27888f02947d7fecdd9044a3e553fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecb7de5df21b8271f5a57ae223971175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5c4b990ed35cad2063db279e7d03dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)图乙中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41d793c851a2f72f787913ba23e459c.png)
(2)挡板上能被粒子击中的区域长度;
(3)能打到挡板上的粒子进入磁场空间的时刻应满足的条件(仅考虑
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2226c87cd629580b57bf520c45c1bf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f986badfc5dea707c164e2ab6c98dd06.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/25/468583ee-6d46-4e40-a2cf-7d52ea522783.png?resizew=327)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
A.小物体所受静摩擦力最大值为![]() |
B.小物体所受静摩擦力最大值为![]() |
C.在最高点P处,小物体所受静摩擦力可能背离圆心 |
D.在M处,小物体所受静摩擦力大小![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd58ca2d1c6c3f5a510566b5a88343b3.png)
A.要经过小岛B。小船渡河的最短时间大于50s |
B.小船到达河对岸的最小路程为281.25m |
C.小船以最小路程到达河岸后能够原路返回 |
D.若小船在静水中行驶速度可变,小船要沿直线从A运动到B,最小行驶速度为2.75m/s |
10 . 某同学想测如图(1)集成电路里很薄的方块电阻的电阻率ρ,同时测干电池的电动势E和内阻r,他设计了如图(2)的电路。已知方块电阻的上、下表面是边长为L的正方形,上下表面间的厚度为d,连入电路时电流方向如图(1)。
①断开开关K,闭合开关S,改变电阻箱R阻值,记录不同R对应的电压表的示数U;
②将开关S、K均闭合,改变电阻箱R阻值,再记录不同R对应的电压表的示数U。
(1)画出步骤①②记录的数据对应的随
变化关系的图像分别对应如图(4)的两条图线,横截距分别为
、
,纵截距为
、
,请判断哪条是步骤①对应的图线,则电源的电动势E=
(2)若考虑电压表内阻的影响,方块电阻的测量值
(3)要测出方块电阻的电阻率,先用螺旋测微器测量上下表面间的厚度d。在测微螺杆和测砧相接时,示数如图(a),在夹方块电阻测厚度时示数如图(b),则厚度d=
(4)方块电阻的电阻率表达式为ρ=