In a slab-milling operation, the width of the medium carbon steel workpiece is 75 mm, its length is 200 mm, and a 5-mm layer is to be removed in one pass. a. What feed speed (mm/s) could be used if the power available for cutting is 3 kW and the specific cutting energy for the work material is 3.6 GJ/m? b. If the cutter diameter is 100 mm and the ideal surface roughness is 1.5 microm- eters (um), what should be the rotational frequency of the cutter? What is the cutting speed'? d. What is the machining time?