A cylindrical bar of 100 mm diameter is orthogonally straight turned with cutting velocity, feed and depth of cut of 120 m/min, 0.25 mm/rev and 4 mm, respectively. The specific cutting energy of the work material is 1 ยด 109 J/m3. Neglect the contribution of feed force towards cutting power. The main or tangential cutting force (in N) is ________