While at the seashore, you observe an airplane that is flying at (10,000 mathrm{ft}). You hear the

Question:

While at the seashore, you observe an airplane that is flying at $10,000 \mathrm{ft}$. You hear the airplane 8 seconds after it passes directly overhead. Estimate the airplane speed and Mach number. If the airplane had been flying at 30,000 ft, how many seconds would have passed before you heard it?

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