When a bow is stretched back and an arrow is shot, what type of energy conversion has occurred?
a. chemical to mechanical
b. elastic to mechanical
c. mechanical to thermal
d. mechanical to elastic

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.