A sphere of mass M and radius R is falling in a viscous
fluid. The terminal velocity attained by the falling
object will be proportional to
(1) MR
(2) M/R
(3) MR
(4) M/R2
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Explanation:
Vo = 2/9 R³(ρ - ρ')g/Rη
But,
m = 4/3 πR³ρ or m ∝ R³
Hence, Vo = M/R
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