如图4 1用轻绳把一个小球悬挂在o点用力f拉小球使悬线偏离竖直方�30°小球处于平衡力f与竖直方�成θ角要使f取最小θ角应是 Template




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tomski如图4 1用轻绳把一个小球悬挂在o点用力f拉小球使悬线偏离竖直方�30°小球处于平衡力f与竖直方�成θ角要使f取最小θ角应是 coloring