Question 1a A torque of 4Nm is required to rotate the intermediate cylinder at 30r.p.m. Calculate the viscosity of the oil. All cylinders are 450mm long. Neglect the end effects. 0.003 m 0.15 m R 0.003 m Question 1b If the viscosity of the oil in the preceding problem is 0.25 kg/ms. What torque is required to rotate the intermediate cylinder at a constant speed of 40r.p.m.?