题目内容
如图甲为应用于机场和火车站的安全检查仪,用于对旅客的行李进行安全检查.其传送装置可简化为如图乙的模型,紧绷的传送带始终保持v=1 m/s的恒定速率运行.旅客把行李无初速度地放在A处,设行李与传送带之间的动摩擦因数μ=0.1,A、B间的距离为2 m,g取10 m/s2.若乘客把行李放到传送带的同时也以v=1 m/s的恒定速率平行于传送带运动到B处取行李,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250033128853554.jpg)
A.乘客与行李同时到达B处
B.乘客提前0.5 s到达B处
C.行李提前0.5 s到达B处
D.若传送带速度足够大,行李最快也要2 s才能到达B处
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250033128853554.jpg)
A.乘客与行李同时到达B处
B.乘客提前0.5 s到达B处
C.行李提前0.5 s到达B处
D.若传送带速度足够大,行李最快也要2 s才能到达B处
BD
试题分析:行李放在传送带上后,在摩擦力的作用下做匀加速运动,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003312901744.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003312917598.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003312948856.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003312963755.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003312979602.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003312995641.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003313010449.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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