An aluminum kettle weighing m1=0.5 kg was filled with water in the amount of m2=2.0 kg at a temperature t1=20 °C and placed on an electric stove with an efficiency of k=30%. The tile consumes power N=5.0•103 W. After what time will the mass of water in the kettle decrease by dm=100 g? Specific heat capacity of aluminum c1=9.0•102 J/(kgK); specific heat capacity of water c2=4.2 • 103 J/(kg•K); specific heat of vaporization for water r=2.3•106 J/kg.
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