A multi-plate clutch is to transmit 12 kW at 1500 rev/min. The inner and outer radii for the plates are to be 50 mm and 100 mm respectively. The maximum axial spring force is restricted to one kN. Calculate the necessary number of pairs of surfaces if µ = 0.35 assuming constant wear. What will be the necessary axial force?
a) 8
b) 10
c) 12
d) 14