: *ANSWERS A LITTLE OFF. You have air flowing through a 0.5 m x 1.0 m vent. The air flows into the vent at a temperature of 300 K and a speed of 1.0 m/s. If the air leaves the vent at a temperature of 250 K, what is the rate of heat transfer that occurs in the vent? Assume that the ideal gas equation holds true for the air in this situation, and the pressure of the air is constant at 1 atm, and that this occurs over a short period of time. View
: If you have air at a temperature of 418 K and a pressure of 3 atm, what is its density if you assume that the ideal gas equation holds true? View
: Calculate the thermal efficiency of a Carnot cycle heat engine operating between reservoirs at 325°C and 35°C. View
: A refrigerator uses 1000W to keep your food cold. How much power is saved if a different refrigerator with a coefficient of performance of 3 is used? (Assume that Q_L is 1000 W) View
: If we wanted to increase the efficiency in the Carnot cycle in the previous question we could… View
: What is the efficiency of a Carnot cycle with the temperature at state 1 of 300 °C and a temperature at state 2 and 3 of 33 °C and the temperature at state 4 of 275°C. View
: Given the coefficient of performance of a heat pump is 1.25 and the heat released into the hot reservoir is 92 W, what is the heat required from the cold reservoir and what is the work required for this output? View
: Consider a refrigerator. What is the coefficient of performance if the heat released is 6.75 Watts and the heat added is 3.75 Watts? View
