In convection currents, the heat rises and colder material sinks

How do you tell if someone actually cares about you? and just say they do?

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.

Photons with the highest energy have the longest period