The terminal velocity of a iron ball of radius 2.0 mm talling through a tank of oil at 20^(@)C is 6.5cms^(9-1) .Compute the viscosity of the oil at 20^(@)C . Density of oil is 1.5xx10^(3)kgm^(-3).Density of iron is 7.8xx10^(3)kgm^(-3).

The terminal velocity of a iron ball of radius 2.0 mm talling through

1.	The terminal velocity of a iron ball of radius 2.0 mm talling through a tank of oil at 20^(@)C is 6.5cms^(9-1) .Compute the viscosity of the oil at 20^(@)C . Density of oil is 1.5xx10^(3)kgm^(-3).Density of iron is 7.8xx10^(3)kgm^(-3).
Answer» SOLUTION :`eta=8.3PI`