⚛️ Physics Quiz 11: Fluids, Pressure, and Buoyancy

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⚛️ Physics · Quiz 011

Extend force and equilibrium reasoning into stationary fluids while reserving continuity, Bernoulli flow, viscosity, and turbulence for later Physics episodes.

Learning goalRelate density, pressure, depth, Pascal's principle, and Archimedes' principle to quantitative and qualitative fluid-static situations.

  • 5 questions
  • Foundation
  • Explanations after finishing
Answered 0/5
FoundationWhich expression defines pressure when a force acts perpendicular to a surface?
Need a small nudge?

Identify the quantity that measures normal force distributed over area.

UnderstandingTwo points lie in the same stationary liquid of uniform density. Point X is deeper than point Y. Ignoring any small density change, how do their pressures compare?
Need a small nudge?

For a static liquid of nearly constant density, focus on the vertical depth below the free surface.

ApplicationWhat is the gauge pressure 2.0 m below the surface of fresh water if rho = 1000 kg/m^3 and g = 9.8 m/s^2?
Need a small nudge?

Gauge pressure from a liquid column is rho g h.

InterpretationIn an ideal hydraulic system, the output piston has five times the area of the input piston. If a 100 N force is applied to the input piston, what output force results, neglecting losses and height differences?
Need a small nudge?

Pascal's principle gives equal transmitted pressure, so compare F/A for the two pistons.

ConnectionA sealed object has volume 0.0020 m^3 and average density 800 kg/m^3. It is held fully submerged in fresh water of density 1000 kg/m^3, then released. Use g = 9.8 m/s^2. Which description is correct?
Need a small nudge?

Compute both the fully submerged buoyant force and the object's weight, then use force balance for the eventual floating state.

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