A concrete slab with a volume of 2 m3 is submerged in water. What force must be applied to keep it in the water? In the air?
V = 2 m3.
g = 10 m / s2.
ρw = 1000 kg / m3.
ρ = 2300 kg / m3.
R – ?
Рв = Р – Fв = ρb * g * V – ρв * g * V = (ρb – ρв) * g * V.
Рв = (2300 kg / m3 – 1000 kg / m3) * 10 m / s2 * 2 m3 = 26000 N.
P = ρb * g * V.
P = 2300 kg / m3 * 10 m / s2 * 2 m3 = 46000 N.
Answer: P = 46000 N, Pw = 23000 N.
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