题目

一物体沿半径为40cm的轨道做匀速圆周运动,已知线速度为0.4m/s,则它的角速度为   rad/s,周期为              s,向心加速度大小为                                                                                  m/s2.                                                                                                                                     答案:1、2π、0.4
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