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V = 7000 lt(1000 cm³ / 1 lt)(1 m³ / 1000000 cm³) = 0.7 m³
ρ = 700 kg/m³
m = ?
P = ?
Formula
m = ρ V = 700 kg/m³(0.7 m³) = 490 kg
P = m g = 490 kg (10 m/s²) = 4900 N