Question

The terminal velocity of a copper ball of radius 2 mm falling through a tank of oil at 20°C is 6.5 cm s^-1 . Compute the viscosity of the oil at 20°C. Density of oil = 1.5 × 10³ kg m^-3 , density of copper is 8.9 × 10³ kg m^-3

Answer 1

η = 0.992 decapoise