Example: Classify the following situations as compressible/incompressible flow Consider a typical air flow around a cruising jetliner at 10km altitude. The speed is now 810 km/h, while the ambient conditions are 0.414 kg/m³, 0.261 atm and -50°C. At the stagnation point, the temperature rises over by 25°C, while the density and pressure changes by more than 30% and 45 % respectively. 2. Consider a car at sea-level, 1 atm and 15°C, going at a speed of 90 km/h. The density is 1.225 kg/m³. At a stagnation point, the density there is found to be 1.228 kg/m³,a mere 0.27 % difference. The temperature rises by 0.311 °C and the pressure changes by 0.38 %.

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A. Suppose a free-fall ride at an amusement park starts at rest and is in free fall. What is the velocity of the ride after 2.3 s? How far do people on the ride fall during the 2.3 s time period?

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