A steel ball of radius 1 mm is falling vertically through a tank of oil at `30°C`. After sometime the ball attains a constant velocity called `cdots`

A steel ball of radius 1 mm is falling vertically through a tank of oil at 30°C . Write down the expression for resultant force acting on the ball?

A steel ball of radius 1 mm is falling vertically through a tank of oil at 30°C . If the density of oil is 2×10^2kg/m^3 , density of steel is 8×10^2 Kg/m^3 and eta of oil 2NS/m^2 , what will be the constant velocity attained by the ball?

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 )