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3. If the Mach number is 0.81 and the speed of an airplane measured by radar is 850 km/h, what is the local speed of

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3. If the Mach number is 0.81 and the speed of an airplane measured by radar is 850 km/h, what is the local speed of sound in kilometres per hour? 4. Research hearing loss in urban vs rural areas. What do you notice? How can you explain this difference

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