1.F=ρgV,F=G+G',G+G'=ρgV,G'=ρgV-G=1.29×10×50-220=425 N.
2.(1)m=100×1%=1 g;(2)m=5700+100=5800,p=1/5800=0.172%;(3)m=100×0.172%=0.172 g.
1.F=ρgV,F=G+G',G+G'=ρgV,G'=ρgV-G=1.29×10×50-220=425 N.
2.(1)m=100×1%=1 g;(2)m=5700+100=5800,p=1/5800=0.172%;(3)m=100×0.172%=0.172 g.