A forage harvester has a cylindrical cutterhead 600 mm in width and 700 mm in diameter. It has 8 knives and rotates at 9

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A forage harvester has a cylindrical cutterhead 600 mm in width
and 700 mm in diameter. It has 8 knives and rotates at 900 rpm. It
is to harvest corn at a feed rate of 65 Mg/h while producing an
average length of cut of 5 mm. The specific cutting energy can be
held to 14 J m/kg when the knives are sharp. The forage is in
contact with the housing for 2.36 radians of arc and the
coefficient of friction between the corn and the steel housing is
0.49. Crop density between the feed rolls is 300 kg/m3.
Calculate (a) the required peripheral speed of the feed rolls, (b)
the maximum height of the throat area, and the PTO power
requirements for (c) chopping, (d) friction, (e) impelling (assume
the impeller peripheral velocity equals that of the chopper), (f)
moving air, and (g) the total power requirement. (h) For
comparison, calculate the total PTO power requirement using. (i)
What length of cut would cause the answers for parts h and i to
agree?