把杠杆架在铁架台上,支点O到杠杆两端点A和B的距离之比为AO:OB=1:2……如图,把杠杆架在铁架台上,支点O到杠杆两端点A和B的距离之比为AO:OB=1:2,A端挂一质量为mA=1kg的空桶,B端挂质量为mB=1.6k
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