13.如图所示质量为m的光�小球夹在竖直墙和装有铰链的薄板oa之间而静止薄板和墙之间的夹角为a当地的重力加速度为g. 1画出小球的 Template




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tomski13.如图所示质量为m的光�小球夹在竖直墙和装有铰链的薄板oa之间而静止薄板和墙之间的夹角为a当地的重力加速度为g. 1画出小球的 coloring