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Determine the radius of a drop of water...

Determine the radius of a drop of water failling though air , if it covers 4.1 cm in 4 seconds with a unifrom velocity Assume density of air is0.001293 `g cm^(-3)` and `eta` for air`1.8xx10^(-4)` poise.

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The correct Answer is:
`0.21xx10^(-4)` cm
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