Density Upthrust And Viscosity
A student finds that a metal cube of mass 216 g raises the water level in a measuring cylinder from 40.0 cm³ to 112.0 cm³. Calculate the density of the metal.
A sealed steel cylinder of volume 2.50 × 10⁻³ m³ is fully submerged in seawater of density 1030 kg m⁻³. Taking g = 9.81 N kg⁻¹, calculate the upthrust on the cylinder.
A small sphere of radius 1.2 mm moves through oil of viscosity 0.65 Pa s at a steady speed of 0.080 m s⁻¹. Calculate the viscous drag force on the sphere.
Which set of conditions must all be satisfied for Stokes’ Law to apply to an object moving through a fluid?
Which statement best explains how the viscosity of a liquid changes with temperature?
A ball bearing is falling through glycerol and has reached terminal velocity. Which statement correctly describes the forces acting on it?
A small sphere falling through a viscous fluid has its speed doubled while its radius is unchanged. By what factor does the viscous drag force change?
A 5.0 kg block of polystyrene foam and a 100 g lump of lead are placed side by side. Which conclusion about density is correct?
Which combination of three forces acts on a steel sphere moving downward through a viscous liquid before terminal velocity is reached?
In Core Practical 2, why must the upper rubber-band marker be positioned several centimetres below the surface of the liquid rather than at the surface?
A student performing Core Practical 2 uses ball bearings of different sizes through the same liquid at constant temperature. What is the independent variable?
Which change would most effectively reduce the percentage uncertainty in the calculated terminal velocity in a falling-ball viscosity experiment?
A helium-filled weather balloon released near ground level rises steadily upward through the atmosphere. Which statement best explains this in terms of upthrust?
A submarine submerged at constant depth opens its ballast tanks and allows water to flood in. The submarine then begins to sink. Which statement correctly explains this in terms of forces?
Two steel ball bearings are dropped into a deep tank of glycerol. Ball Y has twice the radius of ball X. Once both balls reach terminal velocity, how does the terminal velocity of Y compare with that of X?