单选题-单题 较易0.85 引用4 组卷751
如图所示,将一张A4纸(质量可忽略不计)夹在水平放置在桌面上的物理书内,书对A4纸的压力大小为
,A4纸与书之间的动摩擦因数为0.2,要把A4纸从书中拉出,拉力至少应为( )(设最大静摩擦力等于滑动摩擦力)
![](https://img.xkw.com/dksih/QBM/2022/5/28/2988941658939392/2989735828078592/STEM/fc513c085c514056968654b9beb1505a.png?resizew=137)
![](https://img.xkw.com/dksih/QBM/2022/5/28/2988941658939392/2989735828078592/STEM/fc513c085c514056968654b9beb1505a.png?resizew=137)
A. | B. | C. | D. |
21-22高二下·浙江台州·阶段练习
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如图所示,将一张A4纸(质量可忽略不计)夹在英汉字典内,书对A4纸的压力为3 N,A4纸与书之间的动摩擦因数为0.4,要把A4纸从书中拉出,拉力至少应为( )
![](https://img.xkw.com/dksih/QBM/2015/11/20/1575783679401984/1575783679541248/STEM/c690949b-461d-479e-80a2-272e56ce0aca.png?resizew=187)
![](https://img.xkw.com/dksih/QBM/2015/11/20/1575783679401984/1575783679541248/STEM/c690949b-461d-479e-80a2-272e56ce0aca.png?resizew=187)
A.0.6 N | B.1.2 N | C.2.4 N | D.3 N |
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