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Question 6494
NEET Physics · Hard

Mechanical Properties of Fluids: Stokes' Law MCQ

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Stokes' LawHardQuestion 6494

Question

A ball (r=1 mm, ρ=2000 kg/m³) falls in oil (ρ_f=800, η=0.1 Pa·s, g=10). Terminal velocity:
  1. A
    0.0267 m/s
    Correct
  2. B
    0.235 m/s
  3. C
    0.0235 m/s
  4. D
    0.00235 m/s

Correct answer

0.0267 m/s

Explanation

vt=2r2(ρs−ρf)g/(9η)=2×10−6×1200×10/0.9=<strong>0.0267 m/s</strong>v_t=2r^2(ρ_s-ρ_f)g/(9η)=2×10^{-6}×1200×10/0.9=<strong>0.0267\text{ m/s}</strong>.

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