Question

知道物体的浮力,重力,怎么求物体体积与密度?

Answer 1

1.物体下沉

V排 = V

浮力F = ρ水gV

V = F/ρ水g = 8N/（1kg/dm^3)(10N/kg) = 0.8 dm^3

ρ = G/gV = 12N/(10N/kg)(0.8dm^3) = 1.5kg/dm^3

2.物体悬浮

V排 = V

浮力F =ρ水gV = G

V = G/ρ水g = 12N/（1kg/dm^3)(10N/kg) = 1.2dm^3

ρ = G/gV = 12N/(10N/kg)(1.2dm^3) = 1kg/dm^3

3.物体漂浮

V排 < V

浮力F = ρ水gV排 = G = ρgV

ρ/ρ水 = V排/V

ρ < ρ水

ρ < 1kg/dm^3