(Solved): Disks A and B rotate at a constant rate of A=8rad/s and B=20rad/s, respectively as shown ...

Disks $A$ and $B$ rotate at a constant rate of ${?}_A=8\mathrm{rad}/\mathrm{s}$ and ${?}_B=20\mathrm{rad}/\mathrm{s}$, respectively as shown in The gap, $t=0.8\mathrm{mm}$, contains oil for which $?=0.15$ $\mathrm{N}?\mathrm{s}/{\mathrm{m}}^2$. Assume the velocity profile is linear. Determine the torque $T$ required to sustain the motion of disk $B$. Express your answer to three significant figures and include the appropriate units.