As shown in the figure below, the axis is placed on an oil film with a film thickness t of $2$ mm and qualitative coefficient $=0\mathrm{.}02$ N$/$mm$2.$ If the torque that must be applied to the bamboo to rotate at a constant angular speed w$=2$rnd$/$s in equilibrium with the positive wall is $31\mathrm{.}4$ Nm$,$ calculate R in m units.