Which is a mixture that can be separated most efficiently by the size of its parts?
a. salt water
b. drawer of office supplies
c. cooked noodles and water
d. oil and vinegar salad dressing

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 of the following is the phase that results when the moon is on the opposite side of the earth from the sun? a. quarter moon b. crescent moon c. new moon d. full moon

Could we see a galaxy that is 20 billion light-years away?