The viscous force on a sphere of radius moving in a medium with velocity is given by

PHYSICS · Single correct · CBSE · Physics · Mechanical Properties of Fluids · Mechanical Properties of Fluids

Problem

The viscous force

F

on a sphere of radius

a

moving in a medium with velocity

v

is given by

F=6\pi\eta av

. The dimensions of

\eta

are (1)

[ML^{-3}]

(2)

[MLT^{-2}]

(3)

[MT^{-1}]

(4)

[ML^{-1}T^{-1}]