力学平衡用一轻绳将小球p系于光滑墙壁O点,在墙壁和球p之间夹有一矩形Q.PQ均处于静止状态,下列说法正确的是AQ受3个力BP受4个力C若绳子变短,Q受摩擦力将增大D若绳子变长,绳子拉力将变小
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/09 01:28:50
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