a) Continuously changing Mach number
b) Transonic flows
c) Simultaneously modelling high Mach numbers and high temperatures
d) Hypersonic flows
Answer: b
Explanation: Continuous change in Mach numbers can be done in wind tunnels. Transonic and hypersonic wind tunnels also exist. If we try to model high speeds at high temperatures, the wind tends to reduce the temperature as we have wind flowing over the stationary model in a wind tunnel.
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