题目内容
做简谐运动的物体,其位移随时间的变化规律为x=2sin(50πt+
)cm,则下列说法正确的是( ).
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003658337420.png)
A.它的振幅为4 cm |
B.它的周期为0.02 s |
C.它的初相位是![]() |
D.它在![]() ![]() |
CD
对照简谐运动的一般表达式x=Asin
知A=2 cm,T=0.04 s,φ=
,故A、B错,C对,由表达式可以看到振动物体从
到
时在
周期内通过路程为
A,故D正确.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003658431878.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003658337420.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003658446474.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003658462455.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003658368303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003658384344.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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