A tenth grader placed an electric heater for t1=90 sec in a metal vessel containing 1.2 kg of water. During this time, the water heated up to DT = 12 °C. There is no heat loss. Specific heat capacity of water St = 4200
J/kg-C degrees. Express your answer in minutes, round to the nearest tenth.
In this and subsequent questions, consider the heater power to be equal to P = 1.2 kW. How much energy will the heater give to a vessel with water in time 1
? Express your answer in kilojoules, round to the nearest whole number.