如图所示一束平行太阳光垂直水平地面mn射下a为绳拉的小铁球在竖直平面内沿图中直径为1m的虚线圆形轨迹匀速运动.若小球运动一圈时间为0 Template




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tomski如图所示一束平行太阳光垂直水平地面mn射下a为绳拉的小铁球在竖直平面内沿图中直径为1m的虚线圆形轨迹匀速运动.若小球运动一圈时间为0 coloring