| 11. | Columbia was traveling 18 times the speed of sound when it came apart.
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| 12. | Knight can answer about as fast as the speed of sound.
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| 13. | Speed : 1, 350 mph Mach 2 _ twice the speed of sound.
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| 14. | For example, the speed of sound in gases depends on temperature.
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| 15. | This produces a positive speed of sound gradient in this region.
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| 16. | 9 seconds into the burn, SpaceShipOne exceeded the speed of sound.
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| 17. | A similar thing occurs when an airplane travels at the speed of sound.
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| 18. | Tumors typically have a higher speed of sound than surrounding tissue.
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| 19. | Vibrations traveled through the airframe faster than the speed of sound.
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| 20. | The speed of sound at any altitude is a function of air temperature.
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