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The terminal velocity of a copper ball o...

The terminal velocity of a copper ball of radius 2mm falling through a tank of oil at `20°c` is `6.5cms^-1`. Calculate the viscosity of the oil at `20°c.`.(Hints: Density of oil is is `1.5 × 103 kgm^-3` , density of copper is `8.9 ×10^3 kgm^-3`)

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