Which is a part of a vacuum?
a) inclined plane
b) block and tackle
c) wedge
d) lever

Identify the arrows that show the correct direction of heat transfer. 66°f 112°f 98°f

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.

There are two routes similar in terrain; however, one route has an incline of approximately 28 degrees, and you must decide on which route to take. what is the maximum road grade that your fully loaded ecv can climb?