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Fluids and Newton's Laws (Buoyancy)

AP Physics 1· difficulty 4/5

scale

A rock weighs 5050 N in air. When fully submerged in water, the scale reads 3030 N. What is the rock's volume?

  • A

    2.0×10−32.0\times10^{-3} m3^3

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  • B

    3.0×10−33.0\times10^{-3} m3^3

  • C

    2.0×10−22.0\times10^{-2} m3^3

  • D

    5.0×10−35.0\times10^{-3} m3^3

Explanation

Buoyant force =20= 20 N =ρwVg= \rho_w V g, so V=20/((1000)(9.8))=2.0×10−3V = 20/((1000)(9.8)) = 2.0\times10^{-3} m3^3.

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