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Massa jenis air = 1 gram/cm³ = 1000 kg/m³
Tekanan hidrostatis = ρ x g x h = (1000)(10)(8) = 80.000 N/m²
∴ Tekanan hidrostatis = 8 x 10⁴ N/m²
Tekanan udara luar Po = 1 atm = 10⁵ N/m²
Tekanan total = tekanan hidrostatis + tekanan udara luar
∴ Tekanan total = 80.000 + 100.000 = 180.000 N/m² = 1,8 x 10⁵ N/m²
No.4).
Volum balok = 0,1 x 0,2 x 4 = 0,08 m³
Massa jenis ρ = massa / volum
ρ = 58 / 0,08
∴ ρ = 725 kg/m³
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