Calculate the distance that light travels in one year. light travels at 3.0 x 10 km in a second, given that there are 60 seconds in a minute, 60 minutes in an hour, 24
hours in a day and 365 days in a year. (You just calculated a light year)

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.

Selma made a diagram to compare convection and radiation. which label belongs in the area marked x? must involve temperature differences between substances or objects only occurs when molecules are in direct contact involves the movement of fluids based on density differences can occur where there is little or no matter

In what direction does an applied force move an object