Question

A sphere of mass M and radius R is falling in a viscous liquid. The terminal velocity attained by the falling object will be proportional to

(a) R²

(b) R

(c) 1/R

(d) 1/R²

Answer 1

Correct option (a) R²

Explanation :

But as R³ increases, M also increases and ρ is a constant. σ also is a constant. v, the terminal velocity ∝ R².