If timmy is traveling 20 miles per hour south for 2 hours. how far is he displaced

What does the term discrediting mean?

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

Which object is most likely represented by a dot?