如图甲所示重量为6n的正方体铁块被水平吸引力吸附在足够大的竖直磁性平板上处于静止状态这时铁块受到的�擦力大小为 n若对铁块施加一个竖直 Template




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tomski如图甲所示重量为6n的正方体铁块被水平吸引力吸附在足够大的竖直磁性平板上处于静止状态这时铁块受到的�擦力大小为 n若对铁块施加一个竖直 coloring