A single-plate clutch has a friction disc with inner and outer radii of 15 mm and 30 mm, respectively. The friction lining in the disc is made in such a way that the coefficient of friction is 0.3. If the clutch is transmitting 50 kW power at 2000 rpm, the axial force (in N) on the clutch is:
a) 628.32
b) 942.48
c) 1256.64
d) 1570.80
