( 五选三)简谐运动的振动图线可用下述方法画出:如图甲所示,在弹簧振子的小球上安装一支绘图笔 P ,让一条纸带在与小球振动方向垂直的匀速运动,笔 P 在纸带上画出的就是小球的振动图像。取振子水平向右的振子离开平衡位置位移的正方向,纸带运动的距离代表时间,得到的振动图线如图乙所示。下列说法正确的是( )
A.
弹簧振子的周期为4 s
B.
弹簧振子的振幅为10 cm
C.
t =17 s 相对平衡位置的位移是10 cm
D.
若纸带运动的速度为2 cm / s ,振动图线上1、3两点间的距离是4 cm
E.
2.5 s 正在向 x 轴正方向运动
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