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Fair = 8 N g = 10 m/s²
Dit: ρ...?
Peny: a.)Fa = Fu - Fair ⇒ Fa = 10 - 8 ⇒ Fa = 2 Newton
b.)Fa = ρ.g.V ⇒ ρ = Fa / g.V ⇒ ρ = 2 : 0,0002 x 10 ⇒ ρ = 1000 kg/m³