29 points to the best answer
when is heat exchanged during the refrigeration cycle?

during the initial condensation and final expansion of the refrigerant.
during the initial expansion and final condensation of the refrigerant.
during the pumping of hot air into the expansion valve.
during compression and heating of the refrigerant into a super hot vapor.

The editing of digital photos us about the same level of difficulty as editing an analog photo

Consider the simple 3-station assembly line illustrated below, where the 2 machines at station 1 are parallel, i.e., the product only needs to go through one of the 2 machines before proceeding to station 2.what is the throughput time of this process?

Assume that there is a 4% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on three independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?