A tiny oil droplet falls through air with a terminal velocity of 2.0 mm/s. What is the terminal velocity of a similar droplet of three times the radius?
Correct answer A. 18 mm/s
Explanation
Terminal velocity is proportional to r². Tripling the radius multiplies vₜ by 3² = 9, so the new terminal velocity is 9 × 2.0 = 18 mm/s.
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