find coefficient of friction, chip velocity and area of shear plane in an orthogonal machining experiment

Question

In an orthogonal machining experiment using a tool having 6⁰. Rake angle, the following data were collected. Cutting speed 0.5 m/sec, width of cut 3 mm, depth of cut 1m, chip thickness 1.5mm. Assuming that shearing takes place under minimum energy condition.

i) The coefficient of friction between the chip tool interfaces will be

(a) 0.235          (b) 0.339         c) 0.467            (d) none

ii) Chip velocity is

(a) 10m/min          (b) 20m/min           (c) 30m/min         (d) 40m/min

iii) Area of shear plane is

(a) 3mm²          (b) 4mm²           (c) 5.2mm²             (d) 7.1mm²