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+//===========================================================================
+//chapter 8 example 9
+
+clc;clear all;
+
+//variable declaration
+
+V       = 240;	//voltage in V
+I        = 8;		//current in A
+T       = 1;		//time in minutes
+x      =0.6;		//power factor 
+M    = 600;		//meter constant in revolutions per kWh
+
+//calculations
+E     = (V*I*(T/(60))*x)/(1000);		//Energy consumed 1 minute
+S    = E*M;					//speed of the disc in rev/minute
+
+//result
+mprintf("speed of the disc = %3.2f rev/minute",S);