Question 2kg of steam at 100°C and is pumped into a vessel containing 20kg of water with a temperature of 20°C. The heat capacity of the vessel is negligible. When the whole system comes into thermal equilibrium, what is its temperature? a) 55°C b) 65°C c) 75°C d) 85°C e) 95°C You are on holiday in Arizona in the summer and the temperature outside is 50°C. Your hotel room has an air conditioner which can extract 2kW of heat from your room. The only heat transfer occurs through a glass window which has area 1.2m², thickness 2mm and thermal conductivity 0.8Wm K 1. Given that there are no curtains, your room is otherwise well-insulated and the outside temperature stays the same, what is the lowest temperature that the room will reach. a) 35°C b) 39°C c) 42°C d) 46°C e) 49°C
LDUXYW The Asker · Physics
Transcribed Image Text: 2kg of steam at 100°C and is pumped into a vessel containing 20kg of water with a temperature of 20°C. The heat capacity of the vessel is negligible. When the whole system comes into thermal equilibrium, what is its temperature? a) 55°C b) 65°C c) 75°C d) 85°C e) 95°C You are on holiday in Arizona in the summer and the temperature outside is 50°C. Your hotel room has an air conditioner which can extract 2kW of heat from your room. The only heat transfer occurs through a glass window which has area 1.2m², thickness 2mm and thermal conductivity 0.8Wm K 1. Given that there are no curtains, your room is otherwise well-insulated and the outside temperature stays the same, what is the lowest temperature that the room will reach. a) 35°C b) 39°C c) 42°C d) 46°C e) 49°C
More Transcribed Image Text: 2kg of steam at 100°C and is pumped into a vessel containing 20kg of water with a temperature of 20°C. The heat capacity of the vessel is negligible. When the whole system comes into thermal equilibrium, what is its temperature? a) 55°C b) 65°C c) 75°C d) 85°C e) 95°C You are on holiday in Arizona in the summer and the temperature outside is 50°C. Your hotel room has an air conditioner which can extract 2kW of heat from your room. The only heat transfer occurs through a glass window which has area 1.2m², thickness 2mm and thermal conductivity 0.8Wm K 1. Given that there are no curtains, your room is otherwise well-insulated and the outside temperature stays the same, what is the lowest temperature that the room will reach. a) 35°C b) 39°C c) 42°C d) 46°C e) 49°C
Community Answer
CR2PUX
Question 1. The equilibrium temperature is 76.307 ^(@)C. Therefore, the correct option is (c). Data usedLatent heat of vapourization for waterL=2260 xx10^(3)J//kgSpecific heat of waters=4.19 xx10^(3)J//Kg*KLet the equilibrirem temperaterce is T^(@)C.The amount of heat released for 2kg of steam at 100^(@)C to come to 2kg of water at T^(0)C is{:[Q_(1)=mL+ms Delta T],[=2xx2260 xx10^(3)+2xx4.19 xx10^(3)(100∼T)],[=4520000J+8380(100-T)J(m=2kg)],[Delta T=(100-T)^ ... See the full answer