P 10 W L= 20 mm w2 ≥9000 rpm (outer cylinder) 2.60 A shock-free coupling for a low-power mechanical drive is to be made from a pair of concentric cylinders. The annular space between the cylinders is to be filled with oil. The drive must transmit power, = 10 W. Other dimensions and properties are as shown. Neglect any bearing friction and end effects. Assume the minimum practical gap clearance & for the device is 8=0.25 mm. Dow manu- factures silicone fluids with viscosities as high as 10 centipoise. Determine the viscosity that should be specified to satisfy the require- ment for this device. R = 10 mm @₁ = 10,000 rpm 6 Gap clearance P2.60