m=270g=0.27kg
v=m/ρ=0.27kg/2700kg/m^3=0.0001m^3
G=mg=0.27kg×10N/kg=2.7N
F浮=G-F=2.7N-2N=0.7N
ρ液=F浮/vg=0.7N/(0.0001m^3×10N/kg)=700kg/m^3
m=270g=0.27kg
v=m/ρ=0.27kg/2700kg/m^3=0.0001m^3
G=mg=0.27kg×10N/kg=2.7N
F浮=G-F=2.7N-2N=0.7N
ρ液=F浮/vg=0.7N/(0.0001m^3×10N/kg)=700kg/m^3