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An iron ball of radius 0.3 cm falls thro...

An iron ball of radius 0.3 cm falls through a column of oil of density `0.94 gcm ^(-3)` .It is found to attain a terminal velocity of `0.5 cm s ^(-1) `. Determine the viscosity of the oil. Given that the density of iron is `7.8 gcm^(-3)`

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