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F = 300 N
A = 40 cm² = 4*10⁻³ m²
Untuk 1 kaki
P = F / A
P = 300 / (4*10⁻³) = 75.000 Pa
untuk 2 kaki
P₂ = P₁ / 2 = 75.000 / 2 = 37.500 Pa
Nomor 6
ρ₁ * h₁ = ρ₂ * h₂
800 * h₁ = 1000 * 12
h₁ = 15 cm