Which of the following statement (s) are true? a. a low 500 mb height indicates denser air below, and more atmosphere and lower pressure above. b. a low 500 mb height indicates denser air below, and less atmosphere and higher pressure above. c. a low 500 mb height indicates denser air below, and less atmosphere and lower pressure above. d. a high 500 mb height indicates denser air below, and less atmosphere and lower pressure above. e. all the statements above are correct

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)