木块漂浮,G = F浮,叫你求比例的方法,以后也会用到的,
①G木 = m木×g = ρ木×v木×g →
ρ木 = G木÷(v木×g)
②F浮 = ρ水×v排水×g = ρ水×(1-2/5)×v木×g →
ρ水 = F浮 ÷〔(1-2/5)×v木×g〕
③G = F浮
ρ木 :ρ水=〔(1-2/5)×v木×g〕÷(v木×g)= 3 :5
④ρ木 = 3/5 ρ水 = 0.6 × 10^3 kg/m^3
木块漂浮,G = F浮,叫你求比例的方法,以后也会用到的,
①G木 = m木×g = ρ木×v木×g →
ρ木 = G木÷(v木×g)
②F浮 = ρ水×v排水×g = ρ水×(1-2/5)×v木×g →
ρ水 = F浮 ÷〔(1-2/5)×v木×g〕
③G = F浮
ρ木 :ρ水=〔(1-2/5)×v木×g〕÷(v木×g)= 3 :5
④ρ木 = 3/5 ρ水 = 0.6 × 10^3 kg/m^3