阿基米德定律,物体浮在水面,即浮力等于重力F浮力=G=mg=ρ物gV物水中:F浮力=ρ水gV排=ρ水gV物*7/10=ρ物gV物ρ物=7/10ρ水=700kg/m³某液体:F浮力=ρ液gV排=ρ液gV物*7/8=ρ物gV物ρ液=8/7ρ物=800kg/m³
ρ水gV排1= 3/5ρ水gV木=ρ木gV木∴ρ木= 3/5ρ水=0.6×10^3kg/m^3 F浮1= G排1= ρ水gV排1= 3/5ρ水gV木 F浮2= G排12=