5. In a pipe flange facing operation carried out on a lathe, the depth of cut is 12 mm, and the inside and outside diameters of the flange are 250 mm and 500 mm, respectively. The specific cutting energy of the work material is 2.6 GJ/m³, the maximum rotational frequency of the lathe spindle is 6 s-¹, and the maximum feed that can be applied is 0.25 mm. The major cutting-edge angle of the tool is 60 degrees. Find: a. The maximum power required for machining when the machine is operating at maximum capacity b. The cutting force c. The machining time