1,
(1)F浮=ρ液gV排
F浮=1000*10*100*10^-6=1N
(2)G=ρ物gV物
G=7.9*10^3*10*100*10^-6=7.9N
(3)无解,少条件
2,
(1)F浮=ρ液gV排
F浮=1000*10*270/2.7*10^-6=1N
(2)
F拉=G-F浮=0.27*10-1=1.7N
3,
F浮=ρ液gV排
=m排g
=0.04*10
=0.4N
V排=40cm^3
ρ物=m/V
=100/40
=2.5g/cm^3
=2.5*10^3kg/m^3
1,
(1)F浮=ρ液gV排
F浮=1000*10*100*10^-6=1N
(2)G=ρ物gV物
G=7.9*10^3*10*100*10^-6=7.9N
(3)无解,少条件
2,
(1)F浮=ρ液gV排
F浮=1000*10*270/2.7*10^-6=1N
(2)
F拉=G-F浮=0.27*10-1=1.7N
3,
F浮=ρ液gV排
=m排g
=0.04*10
=0.4N
V排=40cm^3
ρ物=m/V
=100/40
=2.5g/cm^3
=2.5*10^3kg/m^3