Question

Two spheres of the same material but of radii R and 3 R are allowed to fall vertically downwards through a liquid of density σ. The ratio of their terminal velocities is:

Options

• 1 : 3

• 1 : 6

• 1 : 9

• 1 : 1

Answer 1

1 : 9

Explanation:

V ∝ r²

∴ `V_R/(V_(3R)) = 1/9`