A rain drop of radius 1.5 mm, experiences a drag force F = (2 × 10 –5 v) N, while falling through air from a height 2 km, with a velocity v. The terminal velocity of the rain drop will be nearly (use g = 10 m/s 2 ):
Text Solution
Verified by ExpertsThe correct answer is:
C
F = mg
2×10 –5 v = 
π r 3 ρ g
v = 
= 7 m/s
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