Pressure

AP Physics 1· difficulty 2/5

At depth 5 m5~\text{m} in a freshwater pool the gauge pressure is 50 kPa50~\text{kPa}. At depth 20 m20~\text{m} in saltwater (ρ=1025 kg/m3\rho = 1025~\text{kg/m}^3, g10 m/s2g \approx 10~\text{m/s}^2), the gauge pressure is

  • A

    100 kPa100~\text{kPa}

  • B

    1025 kPa1025~\text{kPa}

  • C

    150 kPa150~\text{kPa}

  • D

    205 kPa205~\text{kPa}

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Explanation

P=ρgh=(1025)(10)(20)=205,000 Pa=205 kPaP = \rho g h = (1025)(10)(20) = 205{,}000~\text{Pa} = 205~\text{kPa}.

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