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Massa jenis minyak/ρ2 = 0,8 gram/cm³
Panjang sisi kubus/s = 10 cm →Volume/V = s³ = ss*s*s=10³ = 1000 cm³
Bagian kubus yg tercelup di air/V1,= 20%V = 20/100%*1000 = 200 cm³
Sisanya yg tercelup minyak/V2 = (1000 - 200) = 800 cm³
w = Fa1 + Fa2→m.g = ρ1.g.V1 + ρ2.g.V2
m = ρ1.V1 + ρ2.V2→m = 1.200 + 0,8.800→m = 200 + 640
m = 840 gram (C)
Jadi,massa kubus kayu itu 840 gram
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