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A small ball of mass M and density ρ is dropped in a viscous liquid of density ρ 0 . After some time, the ball falls with a constant velocity. What is the viscous force on the ball?

1. F = Mg ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ρ ρ + 0 1
2. F = Mg ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ρ ρ + 0 1
3. F = Mg ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ρ ρ − 0 1
4. F = Mg(1 ± ρρ 0 )

Correct answer: F = Mg ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ρ ρ − 0 1

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