用两根细绳连接一小球,小球始终处于静止状态,细绳
与竖直方向的夹角为
,保持不变,拉力用
表示,细绳
从竖直位置开始缓慢沿顺时针旋转,细绳
的拉力
和对应角度
的关系如图,g取
,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/11/28/2861124671537152/2861233143619584/STEM/bb83ac5b-9dd8-44f0-bc0f-dc951a6746f4.png?resizew=330)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f64fa38725c136504f723019a18dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e93fa313adc4ac7608ba9449fd755212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c4ee1b7d06ac4c703e4c086b425c9c5.png)
![](https://img.xkw.com/dksih/QBM/2021/11/28/2861124671537152/2861233143619584/STEM/bb83ac5b-9dd8-44f0-bc0f-dc951a6746f4.png?resizew=330)
A.当![]() ![]() ![]() |
B.当![]() ![]() ![]() |
C.缓慢顺时针旋转过程中,细绳![]() ![]() ![]() |
D.缓慢顺时针旋转过程中,细绳![]() ![]() ![]() |
21-22高三上·全国·阶段练习 查看更多[3]
(已下线)2022届衡水名师全国卷高三(上)三调考试物理试题甘肃省张掖市某重点校2022-2023学年高三上学期第三次检测物理试题江西省上饶市第一中学2021-2022学年高一上学期期末模拟物理试题(一)
更新时间:2021-11-28 21:36:38
|
【知识点】 平衡问题的动态分析
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【推荐1】如图所示,用一根长为
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A.![]() | B.![]() | C.![]() | D.![]() |
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单选题-单题
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名校
【推荐2】如图所示,工人利用滑轮组将重物缓慢提起,下列说法正确的是( )
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C.重物缓慢拉起过程,绳子拉力不变 |
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您最近一年使用:0次