List of top Manufacturing Processes II Questions on Machining parameters and material removal rate

A CNC milling operation is carried out by moving the tool from the point A to point B in anti-clockwise direction to cut a slot of quarter circle with center at C, as shown. The coordinates of the points A and B are (0,0) and (10,10), respectively. All dimensions are in mm. If the feed rate at point P along x-axis is 6 mm/min, then the feed rate (in mm/min) at point P along y-axis is ______ . (Rounded off to 1 decimal place)

During orthogonal turning, the cutting speed, feed and depth of cut are set as 2 m/s, 0.2 mm/rev and 2 mm, respectively. The specific cutting energy (neglecting the effect of feed force on the total cutting power) is 2 J/mm³. The main cutting force (in N) is _____ . (Answer in integer)

Electro-chemical machining is performed on a flat copper workpiece. If the material removal rate is $2\ cm^3/min$ throughout the process, then the required current (in A) is ______ . (Rounded off to 1 decimal place)
Copper properties: Melting point = $1085 °C$, density = $9\ g/cm^3$, gram atomic weight = $63$, and valency of dissolution = $2$
Faraday's constant = $96500 C$
Stefan-Boltzmann constant = $5.67 \times 10^{-8} W/m^2-K^4$