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AP Physics 1
8.3 Fluids and Newton’s Laws
AdvancedMCQProportional AnalysisConceptual13.1k
Two side-by-side diagrams of a rectangular block in a liquid. On the left, labeled 'Initial State', the block floats freely with a small portion (approximately one-fifth) of its height below the water line. On the right, labeled 'Final State', a hand is shown pushing down on the top of the same block so that a much larger portion (approximately four-fifths) of its height is below the water line.
Initial and final states of a block in a liquid.
A block of mass
\(M\)
floats in a container of liquid. When the block is in equilibrium,
\(20\%\)
of its volume is submerged below the surface of the liquid. A student then pushes the block down and holds it at rest so that
\(80\%\)
of its volume is submerged. What is the magnitude of the downward force that the student must exert on the block?

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