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+//to find the number of plates required
+clc
+P=20//lb/in^2
+u=0.07//friction coefficient
+N=3600//rpm
+H=100//hp
+r1=5//in
+r2=0.8*r1//given
+A=%pi*(r1^2-r2^2)//the area of each friction surface
+W=A*P//total axial thrust on plates
+M=(1/2)*u*W*(r1+r2)//friction moment for each pair of contacts
+T=H*33000*12/(2*%pi*N)//total torque to be transmitted
+x=(T/M)//effective friction surfaces required
+printf("\nNumber of effective friction surfaces required= %.f\n",x)
+