viscousity and terminal velocity questions with solutions

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• MCQmediumProperties of solid and fluidviscousity and terminal velocity

  A solid steel ball of diameter 3.6 mm reaches terminal speed 2.45×10⁻² m/s while falling through oil of density 925 kg/m³. The density of steel is 7825 kg/m³ and g = 9.8 m/s². The viscosity of the oil is:

  Options

  • Option A

    1.68

  • Option B

    2.38

  • Option C

    2.18

  • Option D

    1.99

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• MCQmediumProperties of solid and fluidviscousity and terminal velocity

  An air bubble of diameter 2 mm rises through a liquid of density 2000 kg·m⁻³ with a constant terminal speed of 0.5 cm·s⁻¹. Neglect the density of air and take g = 10 m·s⁻². What is the coefficient of viscosity of the liquid in poise?

  Options

  • Option A

    0.88 P

  • Option B

    8.8 P

  • Option C

    88.8 P

  • Option D

    0.088 P

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• MCQeasyProperties of solid and fluidviscousity and terminal velocity

  A spherical liquid drop of radius R falls through a gas of viscosity η with terminal speed v₁. The drop is then broken into 64 identical droplets, and each smaller droplet falls through the same gas with terminal speed v₂. Neglecting changes in density and using Stokes' law, what is v₁ ÷ v₂?

  Options

  • Option A

    4

  • Option B

    0.25

  • Option C

    32

  • Option D

    16

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