(8 points) air is used as the working fluid in a simple ideal brayton cycle that has a pressure ratio of 12, a compressor inlet temperature of 300 k, and a turbine inlet temperature of 1000 k. determine the required mass flow rate of air for a net power output of 70 mw, assuming both the compressor and the turbine have an isentropic efficiency of (a) 100 percent and (b) 85 percent. answers: (a) 352 kg/s, (b) 1037 kg/s

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?