A 50-mm-diameter steel cylinder 600 mm long falls, because of its own gravity force, at a uniform rate of 0.2 m/s inside a tube of slightly larger diameter. A castor-oil film of constant thickness...

A 50-mm-diameter steel cylinder 600 mm long falls, because of its own gravity force, at a uniform rate of 0.2 m/s inside a tube of slightly larger diameter. A castor-oil film of constant thickness fills the space between the cylinder and the tube. Determine the clearance between the tube and the cylinder. The temperature is 38°C and the relative density of steel = 7.85.