7.如图1所示在匀速转动的圆筒内壁上紧靠着一个物体与圆筒一起运动物体相对桶壁静止.则 A物体受到4个力的作用. B物体所受�心力 Template




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tomski7.如图1所示在匀速转动的圆筒内壁上紧靠着一个物体与圆筒一起运动物体相对桶壁静止.则 a物体受到4个力的作用. b物体所受�心力 coloring