Write a program to solve the following problem. The effects of varying parameters on the performance of an air-standard Brayton cycle are to be determined. Consider a compressor inlet condition of 100 kPa, 20◦C, and assume constant specific heat. The thermal efficiency of the cycle and the net specific work output should be determined for the combinations of the following variables. 

a. Compressor pressure ratios of 6, 9, 12, and 15. 

b. Maximum cycle temperatures of 900, 1100, 1300, and 1500◦C. 

c. Compressor and turbine isentropic efficiencies each 100, 90, 80, and 70%.