Airport Engineering
Speed of

All listed here
Sound varies 2.4 kmph per degree centigrade rise in temperature
Sound at 0°C is called one Mach
Sound at 0°C is 1190 kmph

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Airport Engineering
Effective length of a runway is the distance between

Point of intersection of the obstruction clearance line and the extended plane of the runway surface, and the other end of the runway
Ends of the runway
Ends of the clear way on either side
Point of intersection of the glide path and the extended plane of the runway surface and the other end of the runway

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