Pressure

AP Physics 1· difficulty 2/5

A flat plate of area 0.10 m20.10~\text{m}^2 is submerged horizontally 2.0 m2.0~\text{m} deep in water (ρ=1000 kg/m3\rho = 1000~\text{kg/m}^3, g10 m/s2g \approx 10~\text{m/s}^2). The force from water on its top side (gauge) is

  • A

    20,000 N20{,}000~\text{N}

  • B

    200 N200~\text{N}

  • C

    1000 N1000~\text{N}

  • D

    2000 N2000~\text{N}

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Explanation

P=ρgh=20,000 PaP = \rho g h = 20{,}000~\text{Pa}. F=PA=20,0000.10=2000 NF = P A = 20{,}000 \cdot 0.10 = 2000~\text{N}.

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