2. Draw the Force Circle Diagram superposed at the cutting edge of the Free-bodyDiagram of Chip-Tool-Work combination in single-point machining; and using thesetwo diagrams explain the following: (10 points) a. Hypothesis of Merchant-Ernst's first theory: b. Assumptions of this theory: c. Mathematical expression (equation) of this first theory: d. Weaknesses/Defects of this first theory: e. Assumptions of the second theory (by Merchant): f. Mathematical expression (equation) of this second theory: g. Advantages/Benefits of this second theory: