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What is the viscous force on the drop of...

What is the viscous force on the drop of liquid of radius `0.2` mm moving with a constant velocity `4cm s^(-1)` throught a medium of viscosity `1.8xx10^(-5) Nm^(-2) s`.

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`F=6 pi eta r v`
`6xx(22)/(7)xx1.8xx10^(-5)xx(0.2xx10^(-3))xx(4xx10^(-2))`
`2.7xx10^(-9) m//s`
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