(1)F浮=ρ空气gV=1.29kg/m3×10N/kg×3m3=38.7N.
(2)m=ρV=0.09kg/m3×3m3=0.27kg.
G=mg=0.27kg×10N/kg=2.7N.
G物品=F浮-G=38.7N-2.7N=36N
m物品=G物品/g=36N/(10N/kg)=3.6kg.
(1)F浮=ρ空气gV=1.29kg/m3×10N/kg×3m3=38.7N.
(2)m=ρV=0.09kg/m3×3m3=0.27kg.
G=mg=0.27kg×10N/kg=2.7N.
G物品=F浮-G=38.7N-2.7N=36N
m物品=G物品/g=36N/(10N/kg)=3.6kg.