40 points correct answer
why does hot air rise and cold air sink?

a ) cold air has more kinetic energy than hot air.

b ) hot air has more potential energy than cold air.

c ) cold air is more dense than hot air.

d ) hot air is more dense than cold air.

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.