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物體體積:v=10x10x10=1000cm^3=0.001m^3 浸沒時:F浮=p水gv=1000x10x0.001=10N 而G物=mg=p物vg=600x10x0.001=6N G十F拉=F浮 F拉=F浮一G=10一6=4N
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