两个力
、
夹角成90°作用在同一物体上,使物体通过一段位移过程中,
对物体做功3J,
对物体做功
,则
和
的合力对物体做的功W为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5f1d2054b765cf7ee87e4bd8299869a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-02-29 08:30:19
|
【知识点】 多个力做的总功
相似题推荐
单选题-单题
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容易
(0.94)
【推荐1】一物体放在水平面上,它的俯视图如图所示,两个相互垂直的力
和
同时作用在物体上,使物体沿图
的方向做直线运动。经过一段位移的过程中,力
和
对物体所做的功分别为3J和4J,则两个力的合力对物体所做的功为( )
![](https://img.xkw.com/dksih/QBM/2021/7/8/2759780215767040/2760468313161728/STEM/d85b89d6-b152-4a2e-959f-e58b44727270.png?resizew=84)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f58888df91890a19a1aa7511d19703f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://img.xkw.com/dksih/QBM/2021/7/8/2759780215767040/2760468313161728/STEM/d85b89d6-b152-4a2e-959f-e58b44727270.png?resizew=84)
A.4J | B.5J | C.6J | D.7J |
您最近一年使用:0次
单选题-单题
|
容易
(0.94)
【推荐2】两个互成90°的力分别对物体做了3J和4J的功,则这两力的合力做功为( )
A.7J | B.5J | C.1J | D.12J |
您最近一年使用:0次