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State Stokes' law. The terminal veloci...

State Stokes' law.
The terminal velocity of copper ball of radius 2.0 mm falling through a tank of oil at `20^@ C` is 6.5 cm. `s^-1`.
Compute the coefficient of viscosity of the oil at `20^@ C` . (Density of oil is `1.5xx10^3 kg.m^-3` , density of copper is `8.9xx10^3 kg. m^-3`)

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