A certain liquid lias a viscosity of 1.0...

A certain liquid lias a viscosity of `1.0 xx 10^4` poise and a density of 3.2 g/mL. How long will it take for a platinum ball with a 2.5-mm-radius to fall 1.0 cm through the liquid? The density of platinum is 21.4 g/cc.

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40.5 s

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