Suppose you have an ideal refrigerator that cools an environment at -20.0oC and has heat transfer to another environment at 50.0oC . What is its coefficient of performance?
On a hot summer day, 4.00 x 106 J of heat transfer into a parked car takes place, increasing its temperature from 35.0o1 C to 45.0o C. What is the increase in entropy of the car due to this heat transfer alone?