Amulti-plate clutch connects two in-line shafts, through 4 plates on the driving and 3 plates driven shaft. the plates have inner and outer diameters 120 and 180mm respectively, with coefficient of friction between the plates of 0.28. the clutch transmits 9 kw at 750 rev/min determine: a)- the axial force between the plates b)- the pressures at the inner and at the outer radi c)- the included angle of a cone clutch that would transmit the same power with the same axial force