Which of the following explains why a prototype needs to be made with materials similar to the final product? A prototype needs to be tested for stability and strength.

A prototype needs to be tested for durability and aesthetics.

A prototype needs to be tested for stability and aesthetics.

A prototype needs to be tested for aesthetics and strength.

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?