A 0.264-kg coffee mug is made from a material that has a specific heat capacity of 907 J/kg C° and contains 0.340 kg of water. The cup and water are at 31.2 °C. To make a cup of coffee, a small electric heater is immersed in the water and brings it to a boil in two minutes. Assume that the cup and water always have the same temperature and determine the minimum power rating of this heater.

A small electric immersion heater is used to heat 83 g of water for a cup of instant coffee. The heater is labeled "69 watts" (it converts electrical energy to thermal energy at this rate). Calculate the time required to bring all this water from 19°C to 100°C, ignoring any heat losses. (The specific heat of water is 4186 J/kg-K.) Number i Units

A container holding 4.20 kg of water at 20.0°C is placed in a freezer that is kept at -20.0°C. The water freezes and comes to thermal equilibrium with the interior of the freezer. What is the minimum amount of electrical energy required by the freezer to do this if it operates between reservoirs at temperatures of 20.0°C and –-20.0°C? (Latent heat of fusion of ice = capacity of water = 4186 J/(kg K), specific heat capacity of ice = 2100 J/(kg K)). 333,700 J/ kg, specific heat kJ

A 0.288-kg coffee mug is made from a material that has a specific heat capacity of 930 J/kg C° and contains 0.319 kg of water. The cup and water are at 25.6 °C. To make a cup of coffee, a small electric heater is immersed in the water and brings it to a boil in two minutes. Assume that the cup and water always have the same temperature and determine the minimum power rating of this heater. Number i Units