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Fluids and Newton's Laws (Buoyancy)

AP Physics 1· difficulty 2/5

A block of volume 2.0×10−3 m32.0 \times 10^{-3}~\text{m}^3 is fully submerged in water (ρ=1000 kg/m3\rho = 1000~\text{kg/m}^3, g≈10 m/s2g \approx 10~\text{m/s}^2). What is the buoyant force?

  • A

    2 N2~\text{N}

  • B

    2000 N2000~\text{N}

  • C

    5 N5~\text{N}

  • D

    20 N20~\text{N}

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Explanation

FB=ρgV=(1000)(10)(2.0×10−3)=20 NF_B = \rho g V = (1000)(10)(2.0 \times 10^{-3}) = 20~\text{N}.

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