Fluid mechanics problem :a triangular shaped cylinder is enclosed in a container of oil and rotates at an angular velocity w determine the torque on the shaft when it rotates at 15 RPM. the horizontal gap b/w the cylinder and container G is 2mm the diameter of the shaft is much less than the thickness of the gap. Hint ds/dr=5/3 where s is the distance along the cyliner and r is the distance from the axis of rotaion.