(1)
F浮=F2-F1
(2)
ρA=F2ρ液/(F2-F1)
(3)
物体速度:V物=L/(t2-t1)
有用功率:P有=F2V物=F2*L/(t2-t1)
机械效率:η=P有/P=F2*L/(t2-t1)P
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