(Solved): A conical pointed shaft turns in a conical bearing with an angular velocity , as shown in the ...

A conical pointed shaft turns in a conical bearing with an angular velocity $$?$$, as shown in the figure. The gap between the shaft and bearing is filled with an oil of viscosity $$?$$ and the thickness of the oil film is $$h$$. (a) Obtain an expression for the shear stress that acts on the surface of the conical shaft. (b) Calculate the viscous torque that acts on the shaft.