题目内容
光盘驱动器在读取内圈数据时,以恒定线速度方式读取。而在读取外圈数据时,以恒定角速度的方式读取。设内圈内边缘半径为R1,内圈外边缘半径为R2,外圈外边缘半径为R3。A、B、C分别为内圈内边缘、内圈外边缘和外圈外边缘上的点。则读取内圈上A点时A点的向心加速度大小和读取外圈上C点时C点的向心加速度大小之比为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003537025848.jpg)
A.
B.
C.
D.![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000353780572.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003537025848.jpg)
A.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000353717568.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000353733581.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000353748578.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000353780572.png)
D
试题分析:从A到B过程中:以恒定线速度方式读取,根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000353795565.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000353811699.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000353826554.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000353842667.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000353858818.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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