(a) Assume two identical cars (Car-A) and (Car-B) are travelling on two different roads (Road-A) and (Road-B), respectively. Road-A is at an elevation of 200 m and that of Road-B is at 800 m from sea level. If the two cars are travelling at the same velocity in calm air, discuss which case would have a high Mach number. Neglect the humidity effect (b ) Consider airflow through a variable area duct. At the inlet and the outlet sections, the pressures are 100 kPa and 200 kPa respectively. If the ratio between the change in dA area and change in pressure is negative with relevant sketching, analyze its dp implication in the design of nozzles and diffusers ERSITATEA 960PAH,