Physics

Problem

The viscous force on a small sphere moving slowly through a fluid is expressed as

F = 6\pi \eta r v

, where

r

is the radius of the sphere and

v

its speed. The dimensional formula of the coefficient of viscosity

\eta

is a)

[M\,L^{-1}\,T^{-2}]

[M\,L\,T^{-2}]

[M\,L^{-1}\,T^{-1}]

[M\,L^{-2}]