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Estimate the speed of verticaly falingn ...

Estimate the speed of verticaly falingn raindriops from the following data. Radius of the drops=0.02cm, viscosity of ir `=1.8xx10^-4 poise, g=9.9xx10ms^2 and ` density of water =1000 kg m^-3`.

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The correct Answer is:
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`v=(2)/(9)r^(2)g.((d-rho))/(eta)`
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