First slide

Viscosity

Question

Two spheres of equal masses but radii R and 2 are allowed to fall in a liquid, the ratio of their terminal velocities is

Easy

A

1 :4
B

1:2
C

1:32
D

2:1

Solution

Hero $6 πηrV = (4 / 3) {πr}^{3} ρg = Mg$
$∴ V α (1 / r) for constant mass So, when r is doubled, terminal velocity is halved'$

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