题目内容
如图所示,三根细线在O点处打结,A、B端固定在同一水平面上相距为l的两点上,使AOB成直角三角形,∠BAO=30°.已知OC线长是l,下端C点系着一个小球.下列说法正确的是(以下皆指小角度摆动)( ).
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250036315212311.png)
A.若让小球在纸面内振动,周期T=2π![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003631536475.png)
B.若让小球在垂直纸面内振动,周期T=2π![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003631552615.png)
C.若让小球在纸面内振动,周期T=2π![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003631552615.png)
D.若让小球在垂直纸面内振动,周期T=2π![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003631536475.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250036315212311.png)
A.若让小球在纸面内振动,周期T=2π
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003631536475.png)
B.若让小球在垂直纸面内振动,周期T=2π
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003631552615.png)
C.若让小球在纸面内振动,周期T=2π
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003631552615.png)
D.若让小球在垂直纸面内振动,周期T=2π
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003631536475.png)
A
让小球在纸面内振动,在偏角很小时,单摆做简谐运动,摆长为l,周期T=2π
;让小球在垂直纸面内振动,在偏角很小时,单摆做简谐运动,摆长为
,周期T′=2π
.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003631536475.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003631614862.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250036316301056.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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