Water is boiled at 1 atm pressure in a coffee maker equipped with an immersion-type electric heating element. the coffee maker initially contains 1 kg of water. once boil- ing started, is observed that half of the water in the coffee maker evaporated in 10 minutes. if the heat loss from the cof- fee maker is negligible, the power rating of the heating element is:

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.